Rashard Mendenhall's absence is a factor, but nobody threw the ball more than Haley when he was with the Arizona Cardinals, so we shouldn't be surprised. Roethlisberger has nothing to complain about. Like so many veteran quarterbacks, he wants to call his own plays, because he's at his best when Pittsburgh shifts into the no-huddle and allows the passing game to find its rhythm.
If Haley arrived without a full understanding of what Roethlisberger means to this offense, it must be crystal clear after three weeks of football. If anything, the concern is Pittsburgh's inability to rush the ball combined with a defense that hasn't stopped opponents from scoring. The Steelers' frenzied air show is the only thing keeping this team in games.