That's funny, because the Bills' pass D is higher ranked than their run D. Pass D ranked 11th in the league with the 6th fewest pass TD's against them. Run D is 19th in the league.
Hell, even if you go by passer rating vs. avg. per rush it's pretty close. Bills rank 15th in passer rating against while 11th in avg per rush.
Yet everybody goes on and on about the pass D likes it's the worst thing they've ever seen.
The problem is that the D, overall, is average. Not great vs. the pass, not great vs. the run. Average doesn't cut it when the entire team concept is to control the clock with the running game and win low scoring games.