Avatar blows your mind off when you first watch it. True the story is disappointing, and has nothing much to talk about, but the Direction, the cinematography and the CGI more than makes up for it.
When you watch the movie, you really agree with what james Cameron said. he had been thinking of the idea for 12 years, but waited because the technology to make this was not available earlier. The movie is so huge and spectacular in everything that not even once you feel a CGI animated chanracter or environment is interacting with you. We watched Avatar 3D and must say, it blew us away.
You can read our review of Avatar here.