I've seen the film last Saturday, 3D of course.
(By the way, my brother went with me, we's wearing glasses. He could just conveniently put the 3D glasses over his glasses and was just fine).
It was absolutely the best cinematic experience I ever had. I had to promise myself to just watch the story, and not investigate the CG, or analyze it, or anything other distracting. Just sit there instead and really watch the movie. This is just a great story, and the apparent director's love to details really made this whole world a complex and whole one.
The 3D was just perfect, in the sense that it wasn't "stuffed" with thing that come at you or point at you, or otherwise pop "out" of the screen. Instead - and that's good - the 3D was mainly there to give yo a sense of depth, towards the screen and beyond, giving you the impression to really be there.
Of course there where things that came towards you, but it wasn't overdone.
If you have to watch the movie in 2D, it's still very much worth it. Great story, great visuals. If you just watch and enjoy the movie, like I did, you will rarely "wake up" because something looks CG. Most of the CG world and characters look very real most of the time.
I didn't realize until I booked my seat that the film was actually quite long, and I am happy about that. It gave the story enough room to develop their characters and the world they were on. The culture of the Na'Vi and their spiritual way of life.
Great stuff. I will definitely see this film a second time, just like TU probably will. I never watch films twice, usually. That should tell you what my rating for this movie would be
Cheers,
Frank