Jets quarterback Ryan Fitzpatrick and Redskins quarterback Kirk Cousins chat after Sunday’s game. (AP Photo/Gary Hershorn)

Every week, the folks at Pro Football Focus grade every NFL player on every play on a scale of -2 to 2. A player’s total grade, tallied after adding up the score of every play, provides a beyond-the-box-score idea of how well he played in a given game or over the course of the season, and a means of measuring his performance against other players in the league.

According to PFF, Kirk Cousins’s two-interception game against the Jets was the worst in the NFL in Week 6. The absolute worst.

Cousins completed only 25 percent of his passes of 10 yards or more and his -6.8 grade was nearly twice as bad as the second-worst QB. PFF noted that Cousins’s 4.6 yards per attempt on Sunday was the lowest in the league.

[Jay Gruden’s explanations for Kirk Cousins’s struggles seem long-winded]

Just like a box score, PFF’s grades don’t always tell the entire story, and a bad grade doesn’t necessarily mean that a player performed poorly. In Week 3, Aaron Rodgers threw five touchdowns and zero interceptions in a win over the Chiefs and earned a -.8 grade, which was only slightly better than the -.9 grade Cousins earned in a two-interception performance against the Giants. PFF attempted to explain how that was possible here.

That said, it would be difficult to argue that Cousins wasn’t deserving of the starting QB spot on PFF’s “Worst Team of the Week” for Week 6. A couple of his teammates provided company. Center Josh LeRibeus, who was starting in place of the injured Kory Lichtensteiger, was graded the worst center of the week, and Perry Riley, who had one tackle and allowed four receptions on four targets in pass coverage, was graded the worst linebacker.

Meanwhile, PFF graded Jets running back Chris Ivory and safety Marcus Gilchrist the best at their positions last week. Congrats, all.

 (Thanks to @BurgundyBlog)