Bought it. Loved it. (I'm a sucker for the IP though)
It has some short comings, but I really enjoyed it and can't wait to see the sequel - which will undoubtedly be longer, more polished, and more involved.
I thought the combat was very smooth (not clumbsy/clunky) - though it is not the most involved. And yes, the AI guys don't do too much...
Multiplayer has been a blast though. I love that you can copy the load out of the guy who off'd ya.