PFFniks can correct me if I'm wrong, but I believe PFF grades weight pass defense and run defense equally, while the NFL calls pass plays about 2/3rds of the time. If this is right, that creates a grading skew in favor of run defenders and against sellout pass rushers that doesn't accurately reflect their on-field value.
For example: per ESPN's pass rush win rate, Robert Quinn is beating blocks at easily the highest rate in football (4% above #2 TJ Watt - the same gap that's between #2 Watt and #7 Aaron Donald and Shaq Barrett), and he's turned that into 9.5 sacks.
He's ranked as a 61.8 overall player because he sucks at run defense.
Now Trysten Hill, with a 2 game sample size, is ranked as a 60.8 overall player.
Like... are you really going to tell me that Robert Quinn is as bad as Trysten Hill.
D-Law I think gets a boost in the opposite direction because of his god-level run defense. He's ranked at 87.7 right now, which is higher than Nick Bosa, even though he's struggled for about half the season to date. I'm a DLaw fan, but you're not convincing me that he's had a better season than Bosa.
