Wow, I think I'm the only one who thinks its absolutely crap.
I'll start with the good points, the graphics are brilliant, the best I've ever seen and the new interface is really nice and clean, plsu the choice of cars they have so far is great. The AI are better then last time who punted you off.
Bad points, it feels like Need For Speed Most Wanted, the physics are just hopeless. I overtook 4 people around the outside after I outbraked myself into a corner and went on the grass!! since when in racing do you get points for drifting and you still keep up with the car coming out of the corner.
It feels incredibly arcadey, since when in racing do you get extra points for drifting? When you drift you catch cars in the corners? Drifting slows the car down, not speed it up. Forza was supposed to be a simulation game, that's what made Forza 2 so good. But now it comes into the same genre as NFS.
Personally I'm very disappointed, I was incredibly excited, Forza have lost a customer.