Coming from someone who has seen the 2D version and the IMAX 3D version. I can only say that the experience is taken to a completely new level in IMAX 3D.
Avatar in 3D is the most amazing movie experience. The world comes to life like never before and you feel as if you are actually there.
It takes about 15 to 20 minutes for your eyes to adjust to this new way of watching movies, but it's worth the experience.
The plot is great and builds the characters story very well. It's a love story, an adventure story, a heroic tale that is a pleasure from beginning to end.