Soooo, finally got around to seeing it.
Honestly, there was a bit of exaggeration to make the big baddy really evil, but other than that it is a pretty accurate allegory for what happened early in America's history.
About 75% of the way through I got to thinking: If the Na'Vi were able to manipulate their environment like that naturally, think what kind of biotech they'll shape in 1000 as druidics...