Just watched it the other night at Imax, in 3D. The visuals were breathtaking. They were really good. When it first sorta glided you through the trees I got that downhill roller coaster feeling. It took me awhile to settle in because we sat too far forward, but once I did I was immersed. I couldn't tell if the avatars were actors heavily modified with CG and make up, or if they were entirely CG. Can anyone clarify?
The plot isn't very good though. I didn't really like any of the characters (except the colonel, but that's probably because he's the closest thing to something badass in the movie. Maybe I'm just a retard that way), they were pretty standard archetypes. (including the colonel >_>)