I just got back from seeing it. I will talk about it now.
There will be spoilers.
Everywhere.
You have been warned.
I got first row seats because I was late, so that didn't do much to improve the movie, especially having only a part of my field of view in full 3D and the rest shifted out of polarity. Still, I can safely say the movie met my expectations. Paper-thin plot+characters, gorgeous beauty and impressive animation. I am particularly impressed by the small details of some of the aspects of life on the planet, like how the Pandora atmosphere coming in contact with the indoors atmosphere makes ripples. As for the rest, the animation was nearly flawless. You know how sometimes computer animations don't quite seem to follow the laws of momentum and inertia? Stuff like that stands out like a flare to me, but I don't remember noticing any flaws in this movie. The suspension of disbelief just lasts and lasts.
The amount of imagination and thought that was put into Pandora was very good too. Sure, on one hand you have the name "Pandora", six-legged horses, six-legged dogs, six-legged-other-fauna, big blue men, air jellyfish, dragons. That's taking earth and mixing things up a bit. But on the other, you have trees with nervous systems that create a brain-biosphere, domestication that relies on linking on the neuron level, and bioluminescent, well, everything. I liked that a lot. But seeing how they made a big deal about the linking, I was expecting it to happen with the sex, too. Was anyone else?
And then the final battle. After Grace died, and actually stayed dead - which is always a suspenseful event these days when the near-dead get miraculously saved, or not - I didn't think they would pull off the cheesiest, softiest, Snowy-White-esque twist ever by having the goddamn forest creatures come to the rescue. Holy crap.
Oh, and apparently the biggest budgeted movie of all time made a profit days after release! Also holy crap.