This.
Everyone knew they were short on depth. Once teams figured out how to defend the short passing game, it was up to the Bills to counter that, but they didn't have the talent or depth to overcome it. The injuries pile up when you're outclassed.
Draft well, get healthy and pick up another addition or two like Barnett on the defense and then we can talk. Heck, in Week 5 Gailey was a genious.
I'm actually not too suprised, and neither should you -- if you looked objectively at the roster coming out of camp.