Saw it last night on Imax. At first I didn't like the 3D. Maybe we were sitting too close though (2nd row), because things seemed out of focus on the sides of the screen. Or maybe my eyes needed to adjust, because after a few minutes I got used to it.
Yeah the plot was standard stuff, but I expected that. The dialogue wasn't as bad as I thought it was going to be.
It looked amazing. I thought the animation in the Star Wars prequels looked stiff and fake, but with Avatar I forgot I was watching animation. The naked blue people were convincing. And unlike Watchmen, the naked blue people wear loincloths so you don't have see any blue penis.
I really liked Watchmen though...