I think Big Ben will go down as one of the best Steeler quarterbacks ever because of his two superbowl rings. I don't think Big Ben is a great quarterback or one that will go down in NFL history as a great quarterback. I think he is a good quarterback who played on the right team for a few years.
Ben Roethlisberger is a very good quarterback and probably one of the best to play for the Steelers. However, with all of the off field controversy with him and alleged rape accusations, it does tarnish his reputation for the team. He is a great quarterback, or at least was at one time.
Terry Bradshaw won 4 Super Bowls as the Steelers quarterback, so he's arguably the greatest. Roethlisberger, even though pretty dislikeable, is definitely in the top 10 Steelers quarterbacks of all time. His passing numbers, QB rating, total touchdowns and total yards definitely put him in the category of top QB's.
Ben Roethlisberger is one of the greatest quarterbacks to ever play for the Pittsburgh Steelers. Roethlisberger earned the AP NFL Offensive Rookie of the Year Award in 2004 and his first Pro Bowl selection in 2007. He became the youngest Super Bowl-winning quarterback in NFL history,
helping lead the Steelers, in his second professional season, to a 21–10 victory over the Seattle Seahawks in Super Bowl XL at the age of 23. Roethlisberger led the Steelers to a second Super Bowl title in four seasons as they defeated the Arizona Cardinals in Super Bowl XLIII, 27–23, after completing a game-winning touchdown pass to Santonio Holmes in the final 35 seconds.
The Steelers have had some obvious names behind center like Bradshaw that are iconic, but they've also had many years of it being a dead position to them. Roethlisberger is not an elite quarterback and I'd argue he never really was, but he was the one at the helm for two Super Bowl victories and has had a career with far more good in it than bad.
I think he's a good second best quarterback in the history of the Steelers. The only exception by a longshot is Terry Bradshaw, who had four super bowl rings. As disliked as Roethlisberger is, there's no denying his strength and scrambling ability, especially for someone as big as he is.