JJ, it's basically the story of Pocahontas, but modernized into a Sci-Fi on another planet. Of course, it's also done by Cameron, who it appears can do no wrong. Most of the film is computer generated, however, it's done better than anything we have seen to date, and the 3D tech is stunning.
The fact that it's still selling out every showing, 3 weeks after it's release, is definitely a good sign.
One thing to remember, though, is that it's not entirely big bad fights - there is a love story in there as well, to appeal to the other half of the population.