I haven't seen Avatar, and don't plan on it; but by all accounts it's a fairly simplistic tale of corporations gone bad and heroism for the sake of the natives.
But it's a little ironic to have the movie take that message. After all, the movie is a shining beacon of the wonders of capitalism: the financing, work, and organization required to put the thing together could only be accomplished by an corporation. One that's entirely happy bashing other corporations.
Or as Steven Colbert put it; "I firmly support capitalism, except when it's in my financial interest otherwise."