I've been spending too much time on LFS with my new Fanatec and going back to Forza 3 after about a week is kinda depressing. It's such a pretty game and it's got so many great cars, and the simulation engine itself is sound, but there are so many annoyances with the physics it makes me sad. It's very annoying that 20+ year old cars feel like they have supercar levels of grip, and all the new models feel like they're racing car stiff, the way they gain and lose grip very digitally, like the tires are granite. Understeer and oversteer are very fake and forced feeling, not really dynamic at all. And then we get to the game steering for you in drifts... this makes me want to pull my (quarter inch long) hair out.
In so many ways so awesome, and in just as many ways so disappointing. I hope GT5 does better. I'm not a fanboy, I don't even have a PS3, but I hope they can do better. I hope it's not dumbed down.