is the customization of the cars. It sucked. I hate to bring it up, but Forza 4 has this hands down. Granted they all in the end achieve the same thing......more hp or less weight or whatever, but with Forza you at least feel you have more options. Engine swaps? Drivetrain swaps? Nope. Dont get me started on the livery.......customizing a cars appearance is a big factor with enthusiats. You use the paint and its gone unless you have another one? Decals? I made a RWB Porsche from the GT2 in the expansion pack, right down to the decals on the winglets. Things like tire size, rim diameter, offset, etc......would be nice (especially with the whole stance thing going on) More options for mods on the motor, maybe common swaps?