What's so difficult in controlling the car? it's a matter of practice only. You need to constantly and quickly click the left/right keys to maintain the car control on the turnings. You can get a better control using a Xbox 360 controller or any other better controller (if there any).
And dude Tom Clancy Rainbow 6: Vegas 2: SUX ASS!!!!!!!!!!!!!!!!! you will find yourself playing a high-end old-gen game with no good elements of FPS and a bull shit camera angle. you can play COD4, Crysis, or the good old Americas Army, Delta Force series which are still better then Tom Clancy R6V2 shit.