If you're looking for an early taste two good places to get a sense of the film are David Poland's excellent blog and Jeffery Wells' website. There's a boyish enthusiasm emanating from both of those reports and I say that in the most positive way possible.
I'll hold off on my full review for now. But let me say this. It is an experience. It will do quite well. It will become (or already is) an event movie that you have to see to be part of the conversation. The difference between Avatar and James Cameron's Titanic is that we didn't see Titanic coming. The movie disappointed critics and was being compared to Waterworld.
Already I can feel the industry getting on side with this one. It's going to change the business. How, is hard to say.