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TV Shows That Went Downhill After Season 1

9. 'Game Of Thrones' (2011-'19)
Game of Thrones should really be critiqued in two parts: Seasons 1-5 and Seasons 6-8. It was during Season 5 the HBO series passed George R.R. Martin's novels and thus descended into oblivion. Flying semi-blindly, showrunners David Benioff and D.B. Weiss took over the story controls from Martin and, by the end, had done the show dirty. The first four seasons are arguably amongst the greatest in TV history. The final four? Not so much.