The Ravens have a lot of excuses from the last season. However there is no excuse for their inability to take care of the football. There is also no excuse for their inability to take the football away. Football games often come down to the turnover battle, and the 2015 Ravens turnover ratio was -14.
The biggest problem the Ravens had (from a turnover perspective) was throwing the ball to the other team. The Ravens resorted to using three quarterbacks after Flacco was lost for the season. Flacco threw 12 interceptions in 10 games. Matt Schaub threw four interceptions.