I've played the demo (multiplayer only).
It feels old, boring, and monotonous.
I played a game almost EXACTLY like the multiplayer aspect of the demo, as a kid.
http://www.microsoft.com/games/pc/rallisport_challenge.aspx
it came out in 2002, and looks graphically similar in quality.
TrackMania Nations / United Forever (one of the two is a free download on Steam) offers a completely different art style, along with a racing experience with quick loading, 10 second tracks that require a bit of practicing to perfect.
GRiD is just another racer.
EDIT: Btw, the multiplayer (in the demo) is horrible. You can't name a server, so its guess and check until you find the server your friend is hosting. This is a problem on PC, but I think consoles will use XBox Live and the PS3 equivalent to fix this.