I do think the depth of the line is something that most teams don't have. Being in Dallas, the only reason the Boys didn't make the playoffs I believe was the O-Line, more importantly, no depth. Once Flozell Adams went out, the running game stunk, and Bledsoe started getting hit worse than normal. They had no depth at tackle.
With somewhere around 300+ lineman in the league, I think all the Pats OL are in the top 150-175. While they may not be at the top of their position, they are all very solid, work extremely well together, and have excellent gameplanning by Dante. All it takes is one player in the bottom 10-20% of the league to royally screw things up for the offense.