I saw Avatar a few days ago. About half an hour in I wasn't sure if it was really good or really bad. Then Sigourney said something about a flux capacitor (or something like it) and I gave up. The characters, for some reason, just didn't do it for me.
Granted, I didn't see it in 3D, and it did look nice (though they could cut 45 minutes of dragon-flying). The ferngully/dances with wolves comparisons are about right, I'd say.