Have another look, especially the starting scene I noticed a lot of clipping through the cars etc.
I didn't mean that the animation wasn't smooth, I meant the characters movement looked jerky. As in arms moved too quickly and so on. Basically it's just bad IKA animation instead of getting some decent mo-cap. Not that they can mo-cap everything in there but there are ways of blending mo-cap with IKA to just about anything.
What the game tells you at the end is bull. I've never had a problem gaming at anything over 30fps.
EDIT: I'll run the demo again with willhubs settings, 1280x1024, 4xAA, High, no vsync.