Played the demo a couple of days ago, my impressions:
1. The graphics were not that impressive. It didn't make me marvel like Gears of War 2 did, and the cars didn't look nearly as smooth as the screenshots would indicate. Environments were pretty good, I suppose, but the focus was supposed to be on the cars. They disappoint me.
2. It could just be that I've become detached with racing sims, but I found the demo quite boring to play.
3. I know it's a demo, but they could have not picked some of the most boring cars ever.