Avatar: 9 out of 10.
We'll keep this review brief.
Avatar is as good as you've heard, if not better. You're essentially drawn into an alien world and you're not released for 162 minutes. And then you're sorry you have to leave.
I tried to see it in IMAX 3D, but it's sold out until May. Just see it in regular 3D. It's sensory overload as it is, IMAX might kill you.