Play him. At first I had doubt he wouldn't be ready for this weeks game since he hasn't played a real game in weeks. First off he is playing Cleveland, who although they aren't the worst in the league, they still have let up 1100 passing yards and a slightly above average amount of rushing yards. Expect the Steelers offense to be in full form and I would not be surprised if they let Ben throw the ball. Don't be worried about him not being ready for the game either, multiple sources have gone over his strong work ethic during his suspension, and if there was a time to prove himself and win the fans back this is it. Coaches know this as well, so expect a pass heavy game plan.
It is kinda funny for me to be writing this though, because I do have Roethlisberger and I am not starting him. The reason is simply matchup. I have Jay Cutler playing against the Seahawks who have the 3rd worst passing defense in the league. He is coming off a concussion so this could be a bad decision. I really like him though, he's improved alot last year and loves to put up big numbers. I expect a 300+ yard game from Cutler. Thats fantasy football for you though and its going to be a blast watching it.
Although this picture might suggest otherwise.