Dude, he is nothing like Roethlisberger. For one thing, if he and my little sister both got on a scale, they'd still probably weigh less than Roethlisberger. Not to mention the what? 6 inch height advantage.
For another, he runs for an ass load of yards whereas Ben scrambles primarily to buy time to throw.
Right now he's Mike Vick without the shitty backstory and baggage.