Pretty simple, many of you guys blame him (and only him) when the Bills lose without regard to everything else that is happening on the field. For example, after the Oakland game, numerous people blamed Drew for being sacked 7 times. I broke down the tape and looked at each play on which he was sacked. I posted my analysis here. On each of the sacks, the protection broke down miserably. In most cases, there were two seconds between the time the ball was snapped and when the play blew up. Yet, so many people here insisted it was all Drew's fault. That is one example.
It is a team game. In my view, the game is won or lost on the line of scrimmage. Take it out of the passing context. How many times does WM have first contact with a defender at or behind the line of scrimmage. What does that tell you about whether the line is opening up holes?
Anyway, you (hopefully) get the picture.