I prefer to turn off al the driver aids too.
i dont use traction control, stability control, ABS or brake assist. I think this way, it teachesyou to be a better driver
Any fool can throw a car around with all the aids on but you actually have to concentrate to get the things to do what you want with everything turned off.
The NSX me and Sam put together is a N/A screamer with about 500hp and is a bitch to get round the circuits. Even with Sam's chassis dynamics and geometry knowledge (which in the game is almost perfectly realistic) its still alot of hard work.
Not like the old days of Gran Tourismo when you'd simply put slicks on, deck the hell out of it try to initiate oversteer through power. If you did that with Forza 2, you wind up with a gravel trap picnic!