15.0 PER is normalized to the league average, not the league average for starters. The average PER for starting PGs is well above 15.0. Almost all of the starting PGs in the league have higher opposing PERs than Rondo. Like it or not, Rondo's one of the best defensive PGs in the league.
First off I said Rondo's defense for a PG is pretty good. But claiming that the PER of 14.9 is a "very good" number is disengious. It's help defense and steals that makes him good not his one on one defense. And I claimed that his defense is not so great it elevates him above someone like D. Rose.
D. Rose PER against is 13.3. So honestly that stat does little for your argument. Like I said if you believe that Rondo is better then someone like D. Rose who faces double teams and is the only good player on his team (imagine how that would suck) your an unredeemable homer.
Rondo gets to lead a Ferrari of a team - and Rose gets ...Deng? Rondo is leading a team with 3 of the 8 top ten active scorers in the NBA! On the same team! That might help a guys assist numbers ya think?
This is why GP is being a bit of dick and going ballastic on Rondo. Rondo is a very good player but he is not better then those guys right now. Rondo is ahead of Harris on defense but you can't ignore a 29.9 PER (holy crap)..
And Rose is a better man defender - and a MUCH better scorer. I'd say court vision wise he right there with Rondo as he has such inferior finishers.