Eh, not every park/land needs to be turned into a fantasyland. Not every land needs cartoons. I agree AVATAR isn't the perfect fit, but I think it's a nice change of pace for Disney. Everyone always complains that they only do kiddie stuff, then they announce an AVATAR area and people complain about that too. It's a no win situation for them.
As I said, I agree it's not a perfect fit, but I like the change of pace and I actually like that it isn't a Disney film.