I don't think anyone in their right mind is blaming Fitz - just the injuries alone is enough, throw in a defense that gave up 21 or 28 points in the first quarter about every week made it a little easier to play D on anyone. Number wise it's ugly but between last ditch down 25 point forced throws that were picked and the off the hands of guys who aren't NFL receivers or really NFL players added to the mess. He's a good quarter back when like all QB's has players around him they can move the ball and score. When you have no players around you and one of the leagues worst defenses your not going to look good.
Pittsburgh won games scoring 17-13-14-20-13-23 Bills lost games scoring 21-23-24-24-20- you can win those with a defense. Also scored 41-38-34-31-40 you cant win consistently forced to score 40 pts to win