#4. Pittsburgh Steelers: Ben Roethlisberger & DeAngelo Williams
After 12 seasons and countless big hits, Big Ben keeps ticking right along. Roethlisberger set a career high with a 68 percent completion rate, receiving the fourth-highest grade by PFF. He threw for 3,938 yards and 21 touchdowns, continuing his reliable production that might one day land him in the Hall of Fame.
Amazingly, Le’Veon Bell received the highest grade among Steelers running backs from PFF, despite playing less than half as many snaps as Williams. The veteran running back, in his first year in Pittsburgh, was a savior for the Steelers after Bell went down for the season. Williams rushed for 907 yards and tied for the league lead with 11 rushing touchdowns. He also set career highs with 40 catches and 367 yards, proving he still had plenty left in the tank during his 10th NFL season.