Forza base their driving physics on how the tyre roles druing accelarating/cornering and braking how this plays i don't know,gt5 is based on getting the car setup on entry to the corner and the cornering itself and the braking,i played forze not sure on the number and was less then impressed.
i love GT4 after playing GT3 all my life, you can drift and not come to a complete hault.
but c'mon, we all know micro machines '64 has the most realistic physics.
and i think this is a 'shop, but i dont doubt that renault will produce something equally jizz worthy.