Alot of the cars sound too generic, at least when standard. But some of them sound awesome.
The AC Cobra 427ci Chrome Edition with all the engine work done sounds the best so far through my stereo. ~700hp Supercharged v8 in a ~900kg RWD car, can even hear the whine of the supercharger. Fun to drive too
As for the driving dynamics, I think the standard cars are too soft and roll too much, but once you upgrade the suspension and set them up it makes a massive difference and they come good.
And that Top Gear Lotus Elise challenge is bloody frustrating! I got over it, I's get to 5th after the 1st lap and close right in on the last group and one little touch from a computer car even when its them that hit you and you are DQ... I'll get it eventually though...
Overall i'm enjoying it so far, could have been better but still good.