I loved the CGI and I was totally entertained; however, the plot was very predictable.
They Navi were defined as savages and the invaders (the supposed civilized white man) had no respect for them, because they wanted to mine a mineral they decided was profitable. The desire to kill them was very savage, psychotic, irrational and arrogant.
As a Buddhist, on the other hand it had a great spiritual message that the world doesn't normally live by or value, but is a story that needs to be told nore frequently.
It was definately worth my time to see it at an IMAX theatre. The 3D wasn't bad either. Smile!