I have to say I was really enjoying and badly addicted to 24, season 5 until 3 episodes before the end.
At the end of 5x21 there was another one of those "it nearly finished, but not quite," and to be honest I had just about had enough twists. I just wanted it to be over.
SWMBO however thought it was fantastic right to the very end, which was incidently a departure from the normal 24 ending....
Anyhoo I'm just about to watch the last 2 episodes of Lost season 2 - all we can do is hope that its a departure from the Season 1 "worst season ending ever."