If you have not had a chance to see to Avatar, and/or are on the fence, I would highly recommend it. It's worth the effort. If not for anything else, the sheer visual experience.
It is an absolutely amazing and revolutionary piece of filmmaking. I personally believe this the forefront of a new genre of filmmaking providing the ultimate immersive experience.
I saw Avatar in IMAX 3D - in my opinion the best way to see this film. If you are not able to catch an IMAX 3D version, then see it in any 3D version. The film was shot with special 3D cameras invented by Cameron for the making of this film. Seeing it in 2D will NOT do it full justice.
Thanks Mr. Cameron for once again setting a new standard in epic film creation!