The Steelers went from 5th in the NFL in rushing last year to 16th this year. The Steelers went from 4th in the NFL in points allowed per game to 16th this year. The Steelers went from a +7 on turnovers last year to -5 this year. If you can't run the ball, don't win the turnover battle and your defense gives up an additional 4 points per game then you are not going to win many football games.
Ben should have never started against the Raiders.