Just finished seeing it in RealD 3D at a Cinemark. I have 4 words to say..."hangs with Star Trek". I actually like it better than Star Trek. The story and acting is pretty good (not bad by any means but not a pinnacle of story telling; though, if you think Avatar had bad/horrible acting then the Star Wars saga has to be really bad to you.) The 3D excels though; this is what I've always wanted 3D to look like (more or less!) There is some image ghosting in a few scenes, most noteably where Jake Sully first gets aquainted with his Avatar in the lab and lying on the gurney his feet are somewhat transparent, but that is the only imaging type flaw I really noticed. I absolutely love the 3D world in Avatar: it truely seems to be alive and it is gorgeous in 3D.
The sound was well done too, will need to get it on Blu-Ray to see if it can level up to Star Trek, but initial impression is it falls somewhere ahead of Transformers II but probably behind Star Trek. Lots of explosions and impressive shock wave concussions, but also lots of detail when a lot less mayhem is going on. I did notice some of the animal sounds seem like they were recycled Star Wars or Jurrasic Park creature sounds, the only fault there being I was thinking about them being Star Wars or Jurassic Park sounds because of that. Movie does not seem long at all; it seems to be just right in length - neither dragging on or rushing through its 162 minutes.
I will be seeing it in Real 3D IMAX and 2D to compare the differences....but tonight/this morning was totally worth the ticket price! Can't wait for the Blu-Ray to be released either!
4 out of 5 stars.... you can not miss seeing this one in 3D in the theaters!