played it today, it's shit. given that 90% of the cars are 'standard' cars, it feels like a rehash of GT4, the graphics suck and are NOTHING like any of the promo stuff, the cars feel bloody slow, no clutch button, the damage model is a bloody joke, and the sound STILL sucks. Also hate the daft upgrades (i.e put a titanium exhaust on my GT-R and it still looks stock at the tip and sounds like a vacuum).
Feels like the game was lazily put together, and am glad I didn't buy it. Forza 3 pisses all over it.