What I can't understand right now is the huge number of people, who've seen it in the cinema, now going out and buying it on DVD/Blu-Ray. It makes NO SENSE. Obviously, pretty much any film will be better on the big screen, but, generally, if you like a film at the theatre, you'll like it just about as much at home.
Avatar can not work on the small screen. Obviously, it's different for anyone who didn't see it at the cinema, and is now curious about what all the fuss was about, but why anyone who saw it the way it was supposed to be seen would want to put themselves through what is, essentially, an incredibly mundane film again, without the escapism that the 3D environment created, is completely beyond me.
At least with James Cameron you basically know what you're going to get these days: a huge-budget, visual spectacle, which makes you leave the cinema thinking "wow," but within the hour, when you actually think about the film, turns into extreme disappointment, mostly at yourself for being taken in by the shiny things.