Just tried the demo, it seemed ok but I agree on the everything feels light/weightless comments. I just tapped left on the stick and the car flew into a turn, it just felt really odd. The visuals looked good, and I had a slight 6sec frame rate slowdown as the race started, but from then on it was smooth.
Very angry the way the demo quits straight to desktop, that's nothing short of truly pathetic by such a big name company. They're doing themselves no favours by promoting the game with such an utterly poor demo.