To me this was the key to the loss. Allen was a punching bag out there and no adjustments were made to fix that. We all also seem to have receivers who can't/won't improvise, as in they run their routes and then do nothing to get open afterward in the rare moments Allen had time to throw.
FWIW, despite the numerous flaws in the Bills' game, I thought they competed against the Ravens. The Bills' defense was pretty good. If the offense could have stepped it up a little, it would have been a lot closer, maybe a win.