I saw Avatar in 3d but not IMAX.  While the plot is a bit weak, it is one of the most visually stunning movies I have ever seen.  I recommend it highly if for nothing else than to see the special effects.  Given the accomplishment of the movie, in the future is will not be necessary to have actors or scenery.  Movies can be completely generated in the computer.

The plot is a rather typical environmentalist nativist concoction.  Obviously the humans who colonized Pandora forgot the lessons taught by Cortez and the United States’ handling of native peoples.  While made out to be ruthless, the Pandora colonists had nothing on those who colonized the New World.  Obviously, some remedial history was in order.