Oh my god, I come in here to discuss this pretty sweet looking movie, and this thread is only on it's
first second page and it's getting out of control.
Anyways, Lambeth, it may be simplified, but she is right, it's pretty much a classic tale of Cowboys and Native Americans (Lets be politically correct here XD), except the Natives are Aliens, and the Cowboys are Marines. There's much more to it than that, but that's basically what it's about. She's not saying it's a bad movie, she's just saying the plot doesn't interest her.
And yeah, it has been done before, but when was the last time it was actually done well? This is a new, refreshing take on a classic story, with some added plot elements and such. I haven't seen anything related to Pocahontas in ages, but I don't think they had somebody disguise as a native to go in and learn more about them or whatever in those classic stories. Hell, last time I saw a Pocahontas movie was that old Disney one.

Regardless, I really can't wait to see this movie.
EDIT: OK, so my post brought it to the second page. XD