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The plot of the movie is the exact same storyline as Pocahontas. Like freakishly similar. The British/Earthlings come to Virginia/Pandora to dig up the local delicate ecosystem for shiny rocks. One of the intruders goes native, has some fun running around the woods, learns the importance of living in harmony with nature and marries a princess.
It's just like that... only with Dinosaurs. Lots of Dinosaurs! The gran finale is dinosaurs fighting attack helicopters and giant robots. I guess you could get technical and say they're dinosaur like creatures, since it's another planet but... yeah. So if you see this movie don't expect heartwarming relationships and intricately engineered plot twists. Just go to see Futuristic technology rumble with the late Cretaceous.
Also it helps that they replaced that guy in the purple pilgrim hat from Disney's Pocahontas with Duke Nukem. Yes, Duke Nukem is in the movie. They call him something different and made him a Bad Guy but you should still be able to pick him out.