Too many “what got cancelled too soon” questions, what’s a show that went on too long?
Hard mode: no The Walking Dead
The Office (US version) went downhill in seasons 8 and 9 without Steve Carrell. But the ending of the show was satisfying. They brought back Steve for that.
Casa de Papel. The first season is its own contained story and it was fantastic and ended perfectly. The subsequent seasons were okay, but you could really tell that the writers hadn’t expected the show to continue after season 1, and everything kind of felt made up on the spot and not nearly as well constructed. I watched it because I love some of the actors/characters, but when I recommend it to people, I tell them to only watch the first season.
It had a phenomenal last episode, but I think most people agree that M*A*S*H went on way too long. They really started running out of good, meaty concepts for shows around the time David Ogden Stiers (nothing against him, I like him) joined the cast.
For me, Lost.
Writers introduced way too many mysteries that they didn’t resolve. ABC should have given them less episodes so they were forced to tie up loose ends faster.
Breaking Bad. The whole 5th season seemed unnecessary to me.