Lost

Listen, no one loves Lost more than this reporter. But even I can admit that the show really fell off in its final season.
To my memory, Lost fell off when Sayid (Naveen Andrews) was brought back from the dead in that mysterious, ancient pool in the temple in Season 6. He comes back… evil? As if that’s supposed to make sense? And then he just inexplicably turns good again. Which, listen, we love that for Sayid — but him being brought back from the dead is, to me, the moment I noticed Season 6 take a turn for the worst.
I know that the finale of the show is widely contested and that many people were disappointed by it, but I actually liked it at the time. It’s not perfect and perhaps leaves something to be desired — certainly some questions go unanswered — but all in all, Lost is still a great show, even if it lost a considerable amount of quality at the end.