I didn't really like it the first time around. The second time I around I looked at the controls and it became a lot more clear.
The graphics were really nice, the controls were ok (well, the second time around), the AI was dumb, the sound effects were great, the voice acting and facial animations were average (though there weren't any emotive videos in the game, so it's hard to tell). The gameplay was good.
Sams Average Review Prediction: 7/10
Demo was kinda short
I think it would be cool if they changed the camera controls for the right analogue stick, and mapped invade to the SixAxiS controls.