This is the most amazing visual experience I've ever had watching a movie. DO NOT MISS the opportunity to see this in IMAX 3D!
I have a mild fear of heights that has never been triggered by a movie before. In some scenes of this movie I felt the same fear in the pit of my stomach that I get from being on a ledge or cliff edge.
I've seen just about everything Sigourny Weaver has been in, and it was absolutely uncanny how her face was represented on the face of her avatar. There was no need to suspend disbelief; it was clear that I was seeing her face on her avatar.
I will try to continue my review in a follow-up post...