number one thing that pisses me off about forza is that they only limit the car you can use by class. gt5 is really by make or model or country a lot of the time. i can race my 84 gti against new american cars like mustangs and camaros.
i know i can choose myself, but i don't

h:
edit: i spoke too soon. getting further and they do limit the region.
edit2: now thinking about it, they should have limited it for the first two "seasons" of the world tour. it's really only limited (from what i can see now) for "faster" cars.