Okay, if that wasn't enough words for you, how's this:
The Plot: Dances with Wolves in Outer Space
Reason to see it: not the plot
I had thought I would not live long enough for Hollywood to once again impress me with visual effects, but I was astounded less than two minutes into this film. People criticize the movie for the simplistic plot, but I think that is a strong point. For your first visual experience this rich, you don't want to be side-tracked by wondering which of the Na'vi is secretly Kaiser Sosa. And definitely shell out the extra bucks to see it on a real IMAX screen. I've been disappointed by previous 3D movies on smaller screens, plus the different dimensions of regular screens / IMAX lite movies will reduce the sensation of vertigo in some scenes.
(click to embiggen)If you don't find the IMAX 3D effects amazing, you are a quadruple lobotomized moron with astigmatism. If you walk out of a regular 2D showing and wonder what was the big deal, please see above. If you don't live near an IMAX theater, then put down the sheep and move to civilization, you bumpkin.