I think the reason I noticed was because I was expectin a lot out of PGR3. Probably adding to the disappointment was the fact that the effects and motion blurring still didn't quite get rid of the loss of sense of speed when one limits the FPS to 30FPS. Compared with GT4, the sense of speed just wasnt there (seriously you have to look at the speed meter to tell you're going fast
whereas in any 60fps racer you definitely don't) and then it looked just as bad as GT4 did in terms of aliasing and shimmering. Right next to it was Toca 3 which had almost no shimmering (but most likely being run on a CRT had a lot to do with this) and was running (from what I could tell) a solid 60fps with tons more cars...on a PS2.