I've defended PFF in the past as a purely math based measurement of performance. With some weaknesses for sure but there isn't a system that doesn't.
But they are smoking crack on Hudson's grades.
He doesn't have a single sack, pressure or hurry through 2 games.
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The same applies to JJ Watt. PFF has him as a 63 pass rush grade. Yet ESPN Pass Rush Win Rate has him as the 3rd best win rate in the league at 27%.
Morgan Fox, the guy behind JJ in PRWR has an 81.3 pass rush grade. It's almost like when you slip on a Cardinals jersey your grades automatically drop.
Maybe it's like commentary crews? When you're the Cardinals you get the C team graders.
FYI in ESPN Pass Block Win Rate for O line Justin Murray is 2nd for OT's and Pugh and Josh Jones and 2nd and 5th respectively for interior. Josh Jones is also 2nd in run block win rate. Yet Jones only has a 46.3 PFF grade
Rodney Hudson is 9th in run block win rate at C.
I don't subscribe to ESPN so I can't tell you where Hudson sits in other metrics. Maybe someone who does could tell us.