Well, I have TDU for the XBOX 360, and I have to say I love it. The physics aren't the best, but the concept is great, and it's pretty well executed I think, at least on the XBOX. I obviously don't get any framerate drops or have any issues with the uninstallers like the PC version would have, I just pop the disc in and play.
Now, I just reached Champion level and unlocked the hardcore physics, and I have to say it made a WORLD of difference. The cars now behave 1000000 times more realistically. They feel like they have mass, there's body roll, you can actually lock the brakes, the cars understeer but are controllable with the throttle, it's just way better. A large, heavy car like the Chrysler 300C SRT-8 understeers a lot and feels very heavy, because it is. Something like the Noble M400 is absolutely a joy to drive and very very neutral. The cars now feel much more unique with the hardcore mode on.
Also with hardcore mode, you get a display that actually shows lateral and longitudinal grip for each tire, steering angle, the weight on each tire, suspension deflection, and lateral and longitudinal acceleration. Basically showing that there is actually physics behind the game now. I'm playing it on the XBOX using a controller, so there's still some steering help, but that's completely gone when using a wheel. The car is just far more predictable when in hardcore mode. I think it makes the game at least a thousand times better.