The Blacklist (2013-2023)
James Spader being allowed to freely play a sassy near-omnipotent criminal mastermind was almost enough to keep this show interesting past the first 2 or 3 seasons. But it became extremely clear that there was an original intent to end the show quickly but which kept getting pushed back because it became super popular. I stopped watching around season five which at the point they had done yet another big fake out for the penultimate secret that Reddington is keeping from Liz about their connection. And if you read the wiki synopsis for the last couple seasons they failed/forgot to even reveal what the secret was, which was the foundation of the entire show. Really this is just another example of what happens when a good plot is stretched to death on the rack in order to serilize a few extra seasons.