Ranking D's by yardage never tells the whole story. We may be #2 in yards, but we're #10 in points per game.
Look at it this way, do you trust the D on the field with the game on the line at the end of a game? Stats go out the window at that point.
All that said, I've said I hold Ben accountable. The offense is #13 in scoring afterall. So you could argue the D is holding up it's end of the bargain better than the O.
On the other hand, would you rather have Ben on the field with the game on the line? I would too. So again, stats are misleading.