Part of me feels unsatisfied that the whole saga of Jack didn't really resolve itself on television. In that sense I almost wish he died, because at least we would have gotten closure. But part of me is happy that this ending sets up a film wonderfully, so at least we haven't seen the last of 24. Hopefully they do the story and characters justice on the big screen.
I thought that if Taylor came back to the light at the last minute I'd be angry, but I think they pulled it off well. Her seeing that video Jack made for Kim (I'm assuming) is what broke through to her, his lines about true peace, etc. I thought that was great.
At first I was irritated that Logan didn't die. I feel like they should have effectively ended that era and that character, and him committing suicide after this final attempt at glory failed would have been perfect. But then I thought about it and I almost feel like him failing to kill himself is more fitting for his character. He couldn't even succeed at taking his own life, and now he's doomed to live with brain damage or paralysis, etc.
All in all I'm happy with the finale. I think they did the series justice and allowed for a nice segue into feature films. I'm really going to miss this show. It's the first show that I really got addicted to and fell in love with in my life. What a great series.