NFL mock drafts are opinion based, and so are NFL draft grades. It’s the same with NFL power rankings. Every writer and fan is entitled. Longtime NFL writer Pete Prisco of CBS Sports recently handed out his marks for last week’s three-day procedure in Pittsburgh. In terms of the Carolina Panthers, who made a total of seven selections , he assigned general manager Dan Morgan’s class a “C.” Of the many outlets that have graded the 32 teams, Prisco seems to be in the minority as numerous writers have heaped praise on what the team did with their seven picks. Not a lot of love for the Panthers’ pick of T Monroe Freeling Matthew O'Haren-Imagn Images Prisco liked the club’s second selection in the second round. “ Safety Zakee Wheatley was a ball hawk at Penn State who showed up a lot on tape. He isn’t a big guy, but he will come up and tackle. On the other hand, he wasn’t crazy about Morgan’s choice on Day 1. “I didn’t love the choice of Monroe Freeling in the first round.…