He only played 3 games and 1 quarter last season which they ended up 1-3. This year they are 3-7 so the total record is 4-10. But CB's aren't going to win you games.
He's been targeted the 10th most times in the NFL this season, yet has a meager 6 passes defended and only 1 INT. That's pretty mediocre. He's not a game changer in any way.
And for the PFF dorks who like to use this to win an internet argument, you're not going to like this. They give him a 64.6 grade which is considered just "average".