First, I do recognize the importance of subjective judgement when forming an opinion about the quality of a burn, but anyway . . .
Has anyone determined the “break points” between Class 2 and Class 3 in “Advanced Disc Quality” such as wwenze has done for Class 1: http://forums.hardwarezone.com/showthread.php?t=1445896&goto=nextnewest
And so by trial and error, scanning with different discs:
For Class 1:
PIF max 4
PIE max 9
PIF average 0.09
PIE average 1.99