I'm having a blast with it. Minor complaints. Subs are hard to pull. Takedowns are too easy. Hard to get off the ground but easy to control from the top. Head kicks are way overpowered. Overall it's a good time like ASU said if you have some friends to play with though.
Wow, low interest here, eh?
I played the demo to death and bought this game on launch day. I play it more than any other 360 game, though it's been a couple days. I'm in online leagues at both of the other message boards I visit.
If anyone's looking for friendly online competition, hit me up.