The movie is absolutely gorgeous and I thoroughly enjoyed myself. The motion capture characters are, for the first time in any movie I've seen, believable and thoroughly lifelike. They have inertia and a sense of "heft" when they move. They even emote like good live actors do.
However...Well, it's a lot like Titanic in that the storyline is simplistic and heavy handed. I don't need to be hit over the head with obvious Native-American references (language, theology, appearance, etc.). Nor do I need to be reminded that the environment needs to be protected, mkay? I get it Mr. Cameron...I get it! Also, expect every Cameron cliche you've ever seen.
But that said, it's decidedly worth your time and paycheck to go see it in the theater.