Just saw it in IMAX.
Half a really really great movie. The second half is the best Bond movie to date (going by my not being a Bond fan until the Craig movies)
The first half was boring me, though. The cold open/action sequence was fucking great, however.
Javier Bardem was also really good in it. I've seen complaints that he was too campy, but that's partly what I loved about his character. He was so over the top, but vicious and brutal at the same time.. kind of Joker-ish, now that I think about it. And his cyanide-maimed face was gross.
And Ralph Fiennes and Ben Whishaw as the new M and Q, respectively, are also great additions to the movie/franchise. I look forward to the next two (they're still being filmed together as one story, right?)
Overall, I think Casino Royale was a stronger film but this is very close. I definitely saw the "Dark Knight" of the franchise comparisons. Mendes is a great director, who doesn't get anywhere near the mainstream love he should.