Meh, almost all the Packers PFF run blocking grades are between 60.5 and 63... Myers doesn't stand out...The three exceptions are Jenkins, 81.4, Runyan 50.3 and Tom 44.7...
But I think it's also important to note, I think the Packers OL is trying to be more in a pass blocking set up, more than run setup, because they know passes are going to happen more often and Packers use quick passes to the outside a bit as part of the run game.