PGR3 wasn't playable in TGS, that's why. RR was the best looking of the rest of the games because it was fairly detailed and fluid. If they get Test Drive to above 30fps, it'll look nicer than RR in motion.
Screenshots tell only so little, playing RR really made it feel much better than these screenshots let one believe. PGR3 screenshots look much better than anything else, but I recon I'll need to try and play it myself to really know if they've gotten the real feeling of speed in it.