Wonderfully done, start to finish. The film is gorgeous, the story and characters involving. Allegory to Native Americans everywhere you look. My wife doesn't like science fiction and she loved it.
The 3D was not as in-your-face or eye-popping as I was expecting, but I don't think it's meant to be. I think it was more "seeing" Pandora like we see our own world. I'd have to see it in 2D to truly compare.