I agree 100% - over the last 5 years I've practiced my driving starting with a string of ae86s both 4age and 4ac, a stagea, an accord wagon and a mazda 3.
The mazda 3 in particular was a bit of a weapon - As a factory car the amount of hussle you can muster through a string of corners is pretty fearsome. Driving all sorts of platforms (rwd, awd, fwd, hatchbacks, 4 door sedans, wagons) has really had the most impact on my driving, as well as learning how to drive a fwd quickly and efficiently. The whole FWD cars suck thing is really a load of crap - I'd be happy to take a nicely setup mazda 3 or honda civic over most of the cars on this site or even secret drift if I was looking for the best time on a hillrun.