I know this movie is well over a year old, but seeing as it's sort of the King's Speech of 2009/10, I figured I'd post a review of it anyway because naturally my feelings about it are strong.
Like many of my reviews, this actually isn't a review so much as a kvetch about the people who like the movie in question. Whenever I have a discussion about the merits of Avatar with such a person, I can almost always get them to admit that the plot was asinine and the character depth was nonexistent. Once that's done, the conversation generally proceeds as follows:
Me: So you're saying that a movie can have an asinine plot and nonexistent character depth and still be good?
Person who likes Avatar: Well... yes.
Guess I can't argue with that.