This is definitely one to see just for the visuals. I hated the trailer and had no intention of seeing the film but was dragged by my significant other. The storyline is exactly as shallow and predictable as one would expect - Cameron has a way of making his movies appeal to the masses, whatever the subject matter. But the visuals are good - one of the most immersive films I've seen, at least since the first LOTR.
One thing that bothered me was the sound. They were definitely running it way too loud - certainly over 90dB in the action bits. Had my IEMs on (no music, obviously) the whole time as I was afraid for my hearing.