This movie was awesome. As with all movies available in 3D, I had to see it, and IMAX was even better. Just the graphics and 3D alone were enough to make the movie a good one, they did a real good job setting the scenes well for a 3D experience.
As for the story. Yeah, that was good too. If you like SciFi then you'll go for it. Plus, add in an actual story and you'll really get into it. I think they could've gone into better detail or back story about a few things, some driving points of the plot seemed unlikely given our nations past, but all in all it was good if you just go with it and see it from the minds of the natives.
Definitely a great movie, one of the best I've seen in a really long time!