I saw it yestreday in 3D. The trailers on your PC certainly don't do it justice: it is just far more beautiful and detailed than you can imagine. The 3D is used well to show awesome depth ( particularly height ) in the scenery .
I had read many reviews which often commented on the lack of character development and the somewhat unoriginal story line. I went for basically for the 'eye candy', but neverthless was rapidly sucked in to the world of Pandora hook line and sinker. The unfolding of the complex web of relationship between the planet and creatures was beautifully shown.The 3D imagery has the ability to immerse you in a way that is hard to resist. The rich colours defy description..at times I simply couldn't believe my eyes.
The renditions of Pandora and its creatures were the drawcard for me..I'm not into all the military mechanica , but the final battle scene was pretty stunning. One of the strongest threads is the love story between Jake and Neytiri. Its as powerful as that in Cameron's last epic Titanic. I expect word of mouth of this aspect will draw many more people in to see the film who wouldn't otherwise be in to Sci-Fi fantasy.
Amazingly I didn't even notice the lengthy 2hr 30min, it just seemed to fly by. The 2/3 full cinema broke in to a brief but spontaneous applause at the end until everyone realised what they were doing..people just don't applaud films these days do they
I'm going to gather a few friends and see this again but at the Imax3d some time soon. In this case I think the adage `less is more' just won't apply .