Well .... how many times have we seen the "Man ruins own world ... man tries to ruin other world ... man gets ass kicked" story line used? You can substitute "world" for "country or land" and a whole lot of movies become similar in their theme. So yeah .... Thor is right if you look at it from a theme perspective.
Like I said .... I go to a movie like this particular one to enjoy a spectacle. Big explosions ... great visuals ... and this movie certainly has that. I rate this one the same as Aliens. If I wanted a philosophical discussion I'd just watch Schindler's List or The Pianist again ... or Moon [which is a great movie BTW but it is way different to Avatar].