question: do those PER stats take into account-- how many times u lose your man on a backcut and give up layups? how many defensive rotations u miss that lead to an easy basket for the opponent? how many time the man ur guarding blows by u and get a bucket or assist? how many blockouts u miss that lead to offensive rebounds for the other team?

if not then those stats don't mean much of anything beyond what i can get from a box score.

some assessments u can only make from actually watching with an educated basketball mind and see where players excel or are fucking up. even without stats, it's a very practical assessment, as you can still easily point these things out on video.