Some TV shows arrive with so much promise that they feel genuinely historic. Fans clear their schedules, critics run out of superlatives, and water-cooler conversations turn into extended debates. Then, sometimes slowly and sometimes with alarming speed, the thing that made those shows special begins to slip away. The writing gets lazy, the showrunners lose the thread, or the story simply runs out of road.
What follows isn’t a list of bad shows. It’s a list of shows that were very good, sometimes great, before they became a test of loyalty for their most dedicated viewers. Every entry here earned its early reputation honestly.
1. Game of Thrones
Game of Thrones was deeply political, visually groundbreaking, and featured an impressive cast of characters. The story of Westeros got bigger with each season, and for much of its run the series was both critically untouchable and invincible in the ratings. The political schemes of Westeros’ nobles, the eventual promise of the Night King’s arrival, and Daenerys’s bid to reclaim the Iron Throne enthralled viewers for six near-flawless seasons.
While the performances, production values, and music score were praised in the final season, criticism was mainly directed at the shorter runtime as well as numerous creative decisions regarding plot and character arcs. Many commentators deemed it a disappointing conclusion to the series. A petition to HBO calling for “competent writers” to remake the eighth season gathered over 1.73 million signatures. The final season was heavily criticized for being rushed, giving unsatisfying conclusions to most of its characters, and featuring questionable plot and character developments.
2. The Walking Dead
The pilot episode of The Walking Dead plays like a movie, deftly capturing the scope and scale of the zombie apocalypse. It’s filled with exhilarating action set-pieces, but it focuses solely on Rick Grimes coming to terms with a terrifying new world. That pilot gripped viewers around the world, and The Walking Dead quickly became one of the highest-rated shows on the air.
The decline in viewership began around the time of the Season 7 premiere in 2016. Fans believe the violent deaths of Abraham and Glenn in that premiere led to a dramatic exodus of viewers, and controversial storytelling choices like cliffhangers negatively impacted audience investment. From Season 7 onward, average same-day ratings for The Walking Dead declined by a precipitous amount in both the 18-49 demographic and total viewers, with the numbers roughly cut in half. While the show continued to run for a full eleven seasons, it never fully regained its lost viewership.
3. Dexter
Dexter had a successful run for 8 seasons between 2006 and 2013 before returning in 2021 for the soft-sequel Dexter: New Blood, though many critics and fans alike felt there was a definite point that the show’s quality dipped. The first four seasons, particularly the Trinity Killer arc in Season 4, are widely regarded as among the best television of their era.
Dexter faced a quality decline after Season 4, culminating in a famously disappointing series finale in Season 8. Season 5 started the downward trend with narrative issues, leading to unsatisfying storylines and character departures. Season 7 marked a return to form, but Season 8 failed to tie the story elements together, leaving viewers disappointed. The famously panned series finale is often grouped with other endings that disappointed fans, such as Game of Thrones and How I Met Your Mother.
4. Lost
When Lost premiered in 2004, it genuinely felt like nothing else on television. The mix of survival drama, character backstories, and deeply layered mystery made it appointment viewing on a global scale. Its ambition was one of the things that made it so compelling to watch, and for several seasons the mysteries only deepened in satisfying ways.
Lost is known now for its awful finale, but truthfully the entirety of the series had a downfall slump that predated the ending. Season 6’s finale left fans very disappointed because many couldn’t understand what they had just watched. The season featured two alternate timelines, and it all ended with Jack Shepherd dying on the island only to wake up in a church with other survivors. Given how confusing and convoluted it was, the Lost finale became as famous as the show itself, and not in a good way.
5. Westworld
The first season of Westworld is widely regarded to be absolutely fantastic, maybe even flawless. The HBO drama blended Western aesthetics, science fiction, and deep philosophical questions about consciousness in a way that felt genuinely fresh. Its twisty narrative and world-class cast made it one of the most talked-about debuts of the 2010s.
Season 3 saw a steep drop in both viewership and quality, with poor character arcs, messy writing, and the death of several key characters. While the first season of Westworld was the most watched of any HBO original, Season 4 experienced roughly an 80 percent drop in viewership. Westworld never recovered from Season 3, with most fans never making it to Season 4, and HBO’s cancellation announcement even received positive feedback from social media, with many commentators arguing the show should have been canceled sooner.
6. Killing Eve
The first season of Killing Eve was an incredible mix of strong characterization and sexual tension packaged in a thrilling spy series. With Fleabag creator Phoebe Waller-Bridge as showrunner, the debut had viewers on the edge of their seats while keeping them amused with sharp, clever dialogue and powerful feminist themes. The sociopathic assassin Villanelle was unlike any other killer on television.
Killing Eve changed hands between showrunners every season, so each season became a different writer’s interpretation of something that already worked. The series got off to a really strong start under Waller-Bridge in Season 1, but its quality gradually declined until its fourth and final season, widely considered the worst by far. Killing Eve’s finale left fans disappointed, with viewer scores dropping dramatically from the premiere’s ratings.
7. Heroes
Heroes premiered on NBC in 2006 and was an instant hit. The series followed ordinary people who discovered they had super abilities, weaving together multiple storylines that built toward a shared destiny. With its compelling characters and comic book-style structure, the first season earned critical acclaim and a massive fan following.
Unfortunately, the show struggled after its breakout debut. The 2007 writers’ strike disrupted production, and later seasons became increasingly convoluted and uneven. Viewership declined, and NBC canceled the show after four seasons. The writers’ strike cut the second season from 24 episodes to 11, disrupting planned storylines, and creator Tim Kring later admitted the abbreviated season damaged the show’s narrative arc, forcing abrupt resolutions to plots that needed more development.
8. Glee
Glee’s first run of 13 episodes was the most critically acclaimed the show ever was. The first season was commended for being a realistic and unflinching look at the struggles of being unpopular in secondary school and for creating storylines out of the financial difficulties of an underfunded school club.
Starting with its second series, the show became more indulgent, ruining some viewers’ sense of immersion with elaborate musical numbers at the drop of a hat and rapidly changing character plotlines that seemed to double back on themselves. Controversial plot choices, cast losses, setting changes, and retools led to later seasons becoming progressively less liked. Fox executives made a critical error by renewing Glee for additional seasons after its breakout first year, and this unprecedented vote of confidence backfired as the writers could not maintain quality across 22 episodes per season.
9. House of Cards
When House of Cards landed on Netflix in 2013, it made history as the platform’s first original prestige drama. Kevin Spacey’s portrayal of the calculating Frank Underwood was compulsive viewing, and the show’s cold political cynicism felt both shocking and entirely believable. Its early seasons set a standard that streaming television is still trying to match.
The general consensus is that House of Cards began to decline after the end of Season 2, when Frank Underwood’s character becomes president. At that point, his scheming no longer carries as much gravity, and the central tension starts to get old. House of Cards was a big success, but due to allegations of sexual misconduct against Spacey, Netflix had to rethink the show’s final season entirely. Viewers rated the final episode a very low score, a striking fall from the premiere’s impressive ratings.
10. 13 Reasons Why
The first season told the story of the aftermath of a teen suicide, touching on many important issues affecting young people. With themes around bullying, depression, and self-harm, the debut season of 13 Reasons Why was a well-written and highly accomplished examination of teenage grief and suffering.
Based on Jay Asher’s 2007 novel, 13 Reasons Why needed to be a limited series, and went off the rails when it continued. Netflix’s judgment was clouded by Season 1’s success, and subsequent seasons took these important messages to the extreme, bordering on glorifying self-harm and teen suicide. Releasing only Season 1 would have created a relevant message for young audiences, but continuing the show for four entire seasons made a mockery of the original concept. The plot became convoluted, the characters became outlandish and abrasive, and reviews became increasingly negative.
There’s a recurring pattern in almost every show on this list: the moment the story outpaces the writers’ ability to manage it, or the moment a key creative voice walks away, something irreplaceable is lost. Audiences are remarkably forgiving of one rough season, but when a show’s decline starts to feel like a direction rather than a detour, trust erodes fast. The sharpest lesson these series leave behind may be a simple one: knowing when to stop is its own form of storytelling craft.
