Saw Avatar last night. It's certainly visually stunning, breathtaking. Not only the 3D, but the visualisation and artistic design of the planet, which comprises a vast luminous forest that glows at night, along with geological formations made of 'unobtanium' that has strange levetational properties, leading to amazing floating mountains.
The setting is so magnificent that it holds the film together, and I enjoyed it a lot, despite the fact that the plot was essentially predictable and cliched. Moreover, the main character annoyed the hell out of me for the first hour or so, because he's so damn stupid. But overall it's the classic hero's journey, as a human comes to value the culture of the indigenous people and fights for them against the greedy, violent humans who want to murder them all so they can mine the unobtanium.
I would certainly recommend seeing this in the cinema.