Some guy named Pete who has been anointed over at PFF Tweeted the following:
Shea McClellin: 2nd-worst
@PFF grade of any 4-3 DE in Wk 9. But 2 loud sacks, so naturally NFC Defensive Player of the Week.
PFF attempts to qualify the performance of a player over the course of an entire game and thus weighs a run stop on 2nd and 3 in the first quarter equally to a run stop on 3rd and 1 with the game on the line in the fourth quarter. This is essentially what the baseball metrics folks do. They believe players play to their numbers.
But football is a situational sport. If your analytics tell you Shea McClellin played poorly Monday night, you have to acknowledge in the text of that piece the limitations of your analytics.
I responded via Twitter: