They have no QB. The season begins and ends there... especially for the "weapons." Harry is in the head trauma ward due to the QB, not because he can't separate. You don't need to have the best QB in the league, but you need to have at least "good" QB Play, they don't have that.
They have the 30th ranked QB in the NFL in QR Rating. He has 2 TD's, 7 INT's, 3 Fumbles and oh yeah, he's only thrown the 29th fewest pass attempts in the league, his stats are buffered by the team's fear of letting him throw.
They have quite a bit of talent, but most of it's young and inexperienced. That's a world of difference from no talent. Next season they'll return most of the O-Line and Defensive backfield which are among the best in the league, the kids will have more experience and they'll find their QB in the draft or free agency. They're stacked with picks and flush with cash next season.