Didnt Kordell Stewart, in his first season as a QB (under Gailey's offense) take the Steelers to the AFC Championship game?
And didn't Tyler Thigpen manage a 20 TD, 3 rushing TD, 12 INT season under Gailey?
Neither of those guys are megastars by any means but a championship appearance and a 23 TD production from a QB is still fairly productive in my books.