The best of the movies so far, in my judgment - the most melancholy, the least afflicted by cutesiness. Far better than the book, which is filled with irritating pettiness. I'd have preferred one (very long!) movie to two, but the ending of this is beautiful, bleak and sad and menacing.
Aside from the fact that Michael Gambon is still not as compelling a Dumbledore as the late Richard Harris was, and from worries about whether Maggie Smith will make it through the end of Harry Potter 7, I thought this was the best of the six - the least condescending, the most stylish, the grimmest, the most moving.
I thought it was terrific, it brought me to tears, it's stylish (and the actors are stylish) and classy. The disrupting of the time line allows for sequels and for freedom in plot development. All to the good. It was only 5 hours afterwards that I noticed the one thing that bothered me, namely, that the Star Trek political and moral philosophy had pretty much disappeared; no triumphs of negotiation like that dramatized in the 6th movie, no critique of human excess like that in the 4th, no juxtaposition between war and other means of settling disputes; this is a good-guys vs. bad-guys movie, the bad guys get blown up, the good guys prevail. Very satisfying, as noted, but something's missing.
I was engaged by the movie as I saw it, every minute of it, the stylishness and pacing of it, all the way through to the brilliant credits sequence. But putting it together afterwards I was disappointed, the characters didn't hang together, and the political focus got blurred by the whodunit focus; I prefer my villains to be, well, villainous.