wasn't very impressed with the Rally demo. i think DiRT looks and plays better (meaning the controls, not the framerate, both have pretty solid framerates). it just felt like you were gliding too much and its too much of an arcade racer if that makes any sense. one thing i liked about the visuals over DiRT was there is less aliasing. but for arcade rally racers, i still think MotorStorm is king. it doesn't feel like you're gliding around corners, it actually feels like you're driving through dirt and/or mud. in Dirt/Sega Rally, it almost feels like playing RR7.
I enjoyed Sega Rally more than Dirt demo possibly because of the arcade handling. Lighting wasn't spectacular but AA and framerate were nice. Compared to cars however the environment looks too cartoony. The mirror didn't always showed the car behind me making the damn thing pretty useless for the most part. Track deformation looked and felt nice but way too exaggerated for those tracks in the demo.
I agree however, in terms of gameplay, Motorstorm was the most fun.