Did Ben Roethlesburger sit his first year in the league? I thought he was thrown in pretty quick, and if IIRC won like 7 games in a row?
edit: I just looked it up, he was scheduled to sit the first year, but Charlie Batch got hurt in preseason, moving him up to 2nd string. In the game 2, Tommy Maddox got hurt moving him up to the starter. Ben finished the year going 13-0 and 14-1 including playoffs. Not bad for a rookie imho.
Big Ben, like you said, didn't start right away , but did play most of the rookie year due to injuries
And YES he did very well, he was like 16-2 in his first 18 games. (off the top of my head).
Remember thou, he had a very good team around him, SB champs eventually.