I just picked up Burnout yesterday, I havn't played it yet (I decided I'm not playing anything but COD2 until I finish it) but I watched my GF play it for a while, I really can't stand the graphics, the color pallet and various visual effects just make your feel like everything is part of a dream sequence or something.
Having played the NFS demo it's the same way... I just don't get how some people prefer that over what we see in PGR3