90s = Elite
80s = Great
70s = Good / Above Average
60s = Average
50s = Poor / Below Average
40s = Newman
30s = What the hell going on out there!
In reality it's not that simple as PFF grades in terms of per snap. So if guys have a simple snap count, then you can fairly compare them, but if it's a widely different snap count, then it's unfair.
I'm making this example up, but there have been situations like this. A starter has a grade of 55 with 1,000 snaps, and fans want him benched, and are pushing for a backup with a grade of 62 with 200 snaps.
Well, it took that starter 1,000 snaps to go down 10 points. So the starter actually scored -0.01 per snap. (-10/1,000 = -0.01)
The backup took 200 snaps to go down 3 points. The back scored -0.15 per snap. (-3/200 = -0.15)
So per snap, the Starter was 2/3rd better, and that matched what I saw, but fans were just pissed they kept getting negative grades I'm the first place.
That being said, PFF does try to reduce this with some adjustments based on snaps counts but from what I have seen, they have not fully explained this.
Also, if you want situational grades you have to look further into it. Like Packers team defense score is 70.8 which is good. But their run defense is 58.8.
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