Banks takes the crowd out.  Bend but dont break ( becomes bend then break against good teams), Sunseri like zone, huge cushions, lets dual threat QB run wild, cannot stop good rushing team, can never defend slant pass, cannot get the stop on 3rd and long, poor tackling, poor secondary, poor safety play, slow linebackers, etc.  Eventually, crowd and even players apathy sets in If the defensive scheme and play calling is a fail.  Individual efforts (fans and players) cannot overcome Banks failures as a DC.