Very good movie, a bit predictable in that the big bad-guy is the military machine and the good guys are the natives. Reminds me of movies done hundreds of times. The natives are best approximated as american plains indians in style and action. Maybe the world of Ewoks meets Apache Indians and Fern Gully. Probably a 4.5 star movie.
The 3D was 'mostly' unable to be seen throughout the movie. Much more could have been done in 3D regarding depth. If you are going to make people wear giant oversize glasses that are not very clear (or comfortible) for almost 3 hours, I would have thought you would have made it worth their while.