Rented GRID today, love racers.
The car graphics are very nice, and the car feels reasonably connected to the road. Problems are that the road ahead isn't very clear, and the game seems to deal terribly with panning motion, ie when you turn a corner, there's a horrible loss of detail with the motion blur. Not sure if this is because it's 30fps or not, but it really suffers when panning, something Forza 2 is absolutely perfect at.
I am hoping that it won't annoy me too much as it looks like quite good fun.