So desertdawg, Peterson is our hometown guy and I'm glad he's a Cardinal . . . he's just not a 'shut-down' corner in the same breath with Revis or even Sherman. The numbers don't lie. Too many TDs and big plays in his direction. Last season, the Titans hammered Peterson and it wasn't just their #1 WR Britt doing the damage.
From
https://www.profootballfocus.com/blog/2013/12/16/refo-cardinals-titans-week-15/
Peterson Targeted
As was pointed out on the broadcast, the Titans were not shy about targeting CB
Patrick Peterson, particularly at crunch time. While he’s had a fantastic season, Sunday was not his best as he graded at
-5.2 in coverage surrendering nine catches on 10 targets for 146 yards including the game-tying score at the end of the fourth. While WR
Kendall Wright did the most damage against Peterson catching six of seven passes for 96 yards, he was also the culprit of some big plays against other Tennessee receivers.
Nate Washington beat him on the deep post on the second play from scrimmage in overtime for a 33-yard gain that would have proven to be a huge play had the Titans not turned the ball over on the very next snap. Peterson was also in coverage on the aforementioned game-tying touchdown as WR
Mike Preston beat him on the in-route for the 8-yard score. The only incompletion thrown Peterson’s way was a drop by Wright on what would have been a first down. When Tennessee needed to move the chains, they looked Peterson’s way throughout the game, and they did so with success more often than not.
Don't know if Peterson was injured, overworked, or whatever. Be it certainly wasn't a shut-down corner vs the Titans. I think we will see more of this if Cro is anywhere near healthy. In the past, Cards would field Peterson plus a #2 CB. When a good CB is paried with an average CB, who you going to throw at? That doesn't make the good CB a shut down guy. The PFF rankings has DRC rated ahead of Peterson---what does that say about Peterson? Our guy was the 15th rated CB---a far cry from the meaning of 'shut-down' Sherman was rated as the 6th best player overall.
(Lots of Cardinal stats and evaluations at the ProFootball Focus portal page for the Cardinals. See their reviews of all the games
https://www.profootballfocus.com/blog/category/teams/nfc-west/cardinals/
https://www.profootballfocus.com/blog/category/teams/nfc-west/cardinals/page/2/