Could have ended after one season; later seasons added irrelevant plots and diminished Hannah's story.
Lost its core dynamic after Mulder's departure; the show lacked the same supernatural belief and chemistry.
Continued for 12 seasons despite Charlie Sheen's exit; Ashton Kutcher's addition changed the show's dynamics and reduced viewership.
Shifted focus as original cast graduated, leading to a different atmosphere; increasing production value diverged from the show's origins.
Should have concluded by season 4; extended for two more seasons with a controversial ending that could have been happier.
Long-running show with a new cast after original members left; the show's ambiance has changed significantly.
Declined in viewership after key characters like Rick Grimes and Glenn left; continued without its most beloved characters.
Started strong but became increasingly offbeat and cringe-worthy over seven seasons.
Initially charming, but later seasons introduced bizarre plotlines and characters, straying from the original concept.
Extended for seven seasons with repetitive new villains after the initial mystery was solved, losing its original intrigue.