I just got back from the IMAX 3D showing in Hooksett NH.
As suspected, the story is very simplistic revolving around the bad corporate military types trying to plunder from the innocent natives. I doubt I'm spoiling much by saying that there's a love story and some of the bad military types learn the error of their ways and side with the natives. Yawn.
On the bright side, the visual elements are truly spectacular especially in 3D. The characters are well acted and even though the story has the emotional depth of a teenager, it also has the emotional passion of a teenager, so it's enjoyable even though shallow. Or maybe I'm just getting old and cynical.
I think the real triumph here is in the visualization of the alien world itself. The biology of the planet (animals and plants) is very well conceived, cohesive and realistic, at least as much so as can be done without filling the screen with life that is so alien to the audience that we can't relate to it. The guys who designed the fauna of the planet did a really nice job. There is consistency in the structure of the animals enough to infer their evolution. And there is even a fleeting attempt to explain the "connectedness" of the flora. I noticed that they borrowed a lot of the floral forms from ocean reef examples including giant fan worms, jellyfish and anemones. And given that the things in our oceans that "look" like plants, but are actually animals, I think they were implying that the alien flora might not be plants at all, but more like land based versions of our oceanic animals. An interesting idea for an alien world where the gravity is less than ours.
I was a little bit annoyed with the 3D effect at first because it was distracting, but you get used to it within the first half hour of the show so it's not a big deal. And then once they get into the jungle it really does feel immersive. I would say the overall sense of immersion was pretty impressive. Almost so much that they didn't really need a story. I think I would have been just as happy if all they did was wander around in the jungle poking at plants and running from the critters.
Now I'm curious to see the film in non-3D, just to see how different it is.
The floating mountains were never explained, which I find annoying. But there were enough weird critters, glowing plants and technicolor dragons flying around to cancel that out.
Over all, this film is an IMDB-8 in my opinion. The visual effects and conceptualization of the environment were a solid 10, but the intrigue level of the story was a flat 6. Oh, and the female Na'vi was pretty hot, and mostly naked the whole time, so that might be worth an extra point on the scale.