Kiper/McShay are entertainers that happen to evaluate talent. Just b/c they're on ESPN does not mean they are good at what they do. Kiper is the same guy who ranked Jimmy Clausen as the number 4 overall player in 2010!
McShay has even been accused of plagiarizing other draft analysts (source: http://walterfootball.com/mcshay.php).
If you do take Kiper's analysis seriously though, you should read this from just a week ago: 2012 NFL Draft: Mel Kiper Says Chiefs Need Dontari Poe, Amini Silatolu To Earn 'A' Grade - SB Nation Kansas City