Just played 6 hours of it, my feedback:
-Motion/Radial Blur lags up my game like crazy, causing me to crash unintentionally lots of times. Switched it off and thankfully, it no longer lagged.
-The grass would appear on the track sometimes.
-It's impossible to drift when playing with the keyboard.
-Sometimes when driving into grass, my whole screen would be blocked by some purple or black thing, and I will crash, again. I think it could be a graphic card problem, though it's a new 512mb HD4550 card.
-Some races are impossible to win, because no matter how fast you drive, the computer is always faster using the same car.
However, I suspect the game may be much more fun when playing with a wheel, which I have (but Vista just doesn't want to install it).
Good thing was, I didn't buy it. Guess TDU is probably still the best game purchase I've ever made, my TDU 2 kitty is already full and waiting to be spent (including megapacks etc.)! :D