As some of you may recall from the comments sections in the weekly PFF grades, I'm not a huge fan of their somewhat arbitrary number grading system that doesn't seem to match up with what we just saw most of the time. Statistics, however, are something I can get behind, as there's no opinions to be had with numbers, they're just there. You can form opinions on them (and should), but in and of themselves, they're just there.
Incidentally, that's part of the reason I dislike their number grading system, as it seems to not actually be based on reality, and numbers tend to indicate fact rather than opinion.
Whatever, let's check out the only Giant to make this post of best and worst CB's when looking at completion percentage, yards given up and QB rating.Now a lot of factors aren't taken into account, such as safety help, playing nickel, etc. but at least to me, these are about what I expected when I think of who're "good" and "bad" CBs. Aaron Ross was the only NYG mentioned (aside from Corey Webster being targeted a lot), and it wasn't good. He had the 6th worst completion percentage, with QB's landing an unsightly 67.9% against him. It wasn't just a small sample size, either. Of the ten worst Comp% CBs, only DeAngelo Hall had more attempts at him. He was also #9 in yardage yielded, despite being the least targeted CB amongst the 10.
Finally, QB's had a fairly disgusting 102.8 rating against Ross, bad enough for 10th worst out of the 66 CBs included in this list. Not as bad as Quentin Jammer, who had a barf-worthy 129.9, but pretty bad in and of itself.
On the other side of the coin, it should come as little surprise to the objective observer that names like Darrelle Revis (#1 in both QB % and rating), Asante Samuel (8 and 2), Ike Taylor (2 and 4), Chris Gamble (4 and 3) and Brent Grimes (3 and 10) top this list, as they are counted amongst the top cover corners in the league. The only surprise to me is that Nnamdi Asomugha didn't make the top 10 in either stat. He had a somewhat pedestrian 571 coverage snaps, targeted 47 times, allowed 29 catches (61.7%), 376 yards, QB rating against of 88.6.
http://www.profootballfocus.com/blog/2012/01/12/cornerbacks-a-glance-at-the-2011-numbers/ for the original link.