I think a B is fair the Dolphins draft. That's how i feel about the Patriots' 2011 draft class as well. For the first time in a long while all 4 AFC East teams had solid drafts at once.
I wasn't a fan of the Daniel Thomas pick; he was a productive runninback but he doesn't have any standout/special quality like elite speed/ability to catch out of the backfield. I feel there were better backs available at where Miami picked. Pouncey was a great pick and he turned out better than i expected this season and he'll have a few pro bowls to his name by the time his career is over.
For the Pats I think it's funny how so many people killed the Solder pick and said he wasn't ready to start. He's had a very good season and his presence is key to the Pat's success due to all the injuries on the oline. I don't have ESPN Insider but I know he kept the Pats' grade (c+) the same. I don't see how getting an impact player, several solid contributors (Ridley, Cannon) and several other players who will contribute in the future (Dowling, Markell Carter, Shane Vereen) merits only a C+.