One of the things that separates the Pittsburgh Steelers from most teams is, to put it simply, the fact that they have quarterback Ben Roethlisberger under center. He is a true franchise quarterback, which is not something that many teams are fortunately enough to be able to say about the playing taking the snaps from under center for them.
One of the things that separates a true franchise piece from just a good quarterback is how he performance in certain key scenarios. One of them is passing the ball on third down, which should be no surprise.