I just saw it yesterday in the old-school 2D theater (for discount prices).
Without a doubt, the most visually impressive film I have ever seen. Seeing it in theaters was an experience I will not forget.
Next, I would like to try the 3D version, or even an iMax, but I have a genetically programmed problem with hair-trigger motion sickness, and I would hate to spoil the film for those around me by receiving my popcorn.
As for my review:
I avoided all reviews prior to seeing the film; for the most part I can't stand to listen to injected opinions without forming my own first (this also applies to politics, as a tangent...).
I would say that anyone saying the plot is too simplistic or a rehash of Dances With Wolves is probably oversimplifying matters. There are blatant similarities, but the story is folded into the film well enough without requiring a person to make large leaps into the supposed nuances of the plot, characters, etc. Was it a little bit ham-handed in some ways? Sure, I'll grant that one. I wish modern films could steer away from projecting an opinion about current American politics (Transformers 2, Avatar, etc.). We get it, invading other lands is wrong, attacking civilians is wrong, misuse of force is wrong, blah blah blah blah blah... Only Star Wars III was more blatant in its proselytizing ("Freedom isn't free"...)
THE reason to see the film, I think, is to appreciate the sheer task of how well this alternative world is constructed on film. The organisms, the scale of things, it blows my mind. Everything fits very well, it works together. I liked it a lot. What an amazing visual experience. If you don't want to delve into it any deeper, then look at it as a stunning three hour moving painting.
I hope this movie does well enough to make a second or third film happen. I imagine that this film is a combination of technological testbed as well as a storyboard proof-of-concept. If audiences buy into this one, then Avatar will follow the Matrix and similar films where they'll shoot the second and third film back to back and make a killing. The up front investment in creating a culture and a vision is set, the rest should be comparatively simple. Word already is around that the main actors signed up for rounds 2 and 3.
Anyhow, I loved it, and will probably be seeing it in the theater again.