I wouldn't go so far as to say Ganz SUCKED running the ball. Ganz had the wheels to keep teams honest, but would admittedly never be the center of an option based running attack. Back when he was recruited, he was seen as a "passer that could run" as opposed to Taylor who is a "runner who can (kind of) pass." Zac Taylor, on the other hand, was someone who I would say sucked running the ball.
Ganz was not a fast guy at all, but when given the chance he ran like his ass was on fire.