The whole D looked poor this year and Nate was asked to play a lot of "over" zone coverage all year long, which is not his forte. He's gonna be playing more man "under" (2 cover-2 safeties over the top) type of coverage this season which should get him back to his level of play from 2004, which was spectacular. He's got size, enough speed, hands, supports the run well, etc. I think you have too easily dismissed his previous 4 seasons.