Seeing this in IMAX 3D was a waste of money. It only served to make me nauseous.
Otherwise, this movie is totally Fern Gully with blue aliens! TOTALLY. I mean it looks cool and all, but that's really the only reason I can find for anyone to watch it (especially repeatedly!)
I will say that it kept my attention for two hours, which is pretty difficult to do. I can't sit through most movies. It kept pace really well, especially since it's three hours. So it has that going for it.
That's all. I guess.