Football Outsiders has some interesting O-line analysis:
http://www.footballoutsiders.com/stats/ol Packers are tied for 5th in run blocking, and tied for 25th in pass blocking.
We're #1 in Power running, 5th in not getting stuffed (though at least part of that is having a beast running back who gets lots of yards after contact), 11th in 2nd level blocking and 9th in open field.
We run better up between the tackles, ranking 2nd in up the middle and 3rd in off right tackle (with more than 4.5 yds/attempt adjusted line yards). L tackle drops to just above 4 yds, and around the ends are around 3.5 yds.
Mike McCarthy might want to look at the stats, because we run around the left end more than twice as often as the right tackle (RT ranked last in runs in each direction).