[few spoilers]
Woohoo! It's midnight around here and I'm just back from cinema.
Avatar in 3d. Soo awesome!
When I was in Bloody Valetine 3d I think I first saw the (3d) Avatar trailer. And I knew I had to be in there.
Longer than average which is good. I was in there for the landscapes and the "elves" (Navi). And that was what I got. Lot of elven like things (borrowed a lot from native american and elven culture so I liked it quite much, though they were not that peaceful in their jungle world) and the landscape... a treat for the eyes.

The visual impression: Well. There were both ILM and WETA as large numbers on this one so you do the maths (and probably some Linux kernels in large grids for the tons of computing that were neccessary).

Storywise... well. What do you expect when you go to a fantasy, action or whatever movie. You don't expect high arts of literature nobel prize. Yeah, maybe you could predict some things. Some others were standard (of course or main female star is the princess, dad is tribe leader, mum is spiritual leader) and some others, but hey, it was ok and served its purpose.
The only thing I disliked about the story was the usual problem solution of 2 males have a certain desire for a female so one of the males dies so the other (main male hero) can get the girl. Duh. Stupid.

But if you focus on everything else it's a nice nice movie. Lot of landscapes and visual stuff, sounds, colourful creatures (greetings from StarWars and some Jurassic Park) and elven similar Navi. Blue butt seems to be quite sexy.
The evil side is also done quite well.

Recommended.
(Though violence against elven like creatures should still be banned. )