I finally got the game downloaded and I've got to say, the physics feel downright broken at times. I think the main problem is how the game simulates grip when torque is applied to the rear wheels while turning in any car, not just RWD cars (though, the RWD cars suffer the most). It feels like whenever torque is applied to the rear axle in a corner, grip is progressively reduced with application of the throttle. It doesn't matter how much weight is being transferred to that axle or how the suspension is supposed to react when throttle is applied, More throttle = less grip, it's as simple as that and it's absolutely infuriating because I know from experience that is NOT the case IRL. This wouldn't be so bad if the transition to oversteer was smooth and obvious but it's not, most of the time cars snap instantly to oversteer with little to no warning. I tried tuning all this out of the RX-8 in the game since it's the most similar dynamically to my own IRL MX-5, no dice. Though definitely an improvement over stock, it's still a snappy, oversteery mess and it does not resemble an IRL RX-8 or NC MX-5 dynamically at all.
I'm really bummed out, I was hoping for better from Polyphony after so long. I have several problems with this game aside from the poor driving physics and I'm losing faith in Polyphony because of it. I hope they solve my problems with updates but until then, I'm going back to Assetto.