The Na'vi talk to the earth and the animals. They live in harmony with nature. Through them, Cameron preaches the same simpleton back-to-the-earth bullshit as those phonies who go to Pow-wows and talk out their asses about magical American Indians. Hell, I'm surprised there isn't a cameo by Iron Eyes Cody. It's a really insincere message in a movie ripping off “Ferngully's” plot as its excuse for big-ass explosions and massive battles. “Fighting is bad. Here's some more!”
PLUS: Blockbuster blowback--or why Peter Jackson's The Lord of the Rings trilogy isn't in many “top films of the decade” surveys. The full back-and-forth here, here, here and here.