Let me say that one more time, for emphasis: THERE ARE SPOILERS BEHIND THE LJ-CUT! Don't read if you don't want to know.
Overall, the movie was fabulous, but I feel horridly sad. It's a goodbye movie. It's not just another adventure; it's a farewell. I don't know if I can forgive Joss for some of the decisions he made with this movie. (I think we all know what decision I'm referring to, if you saw the screening.) It was something that was so incredibly unfair and not right, even in the realm of the story.
It was a great movie, that really captured the essence of the show, but I left the showing feeling down and sad.