The Chicago Bears' defense was really good at forcing turnovers. 

Everything else? They were pretty bad at. The Bears allowed the 11th-most passing yards per game in the NFL at 239.2. It shouldn't come as a surprise that Chicago decided to let some of its corners and safeties leave in free agency. 

One play that demonstrates just how bad the secondary was at times was in the Wild Card win over the Green Bay Packers. Matthew Golden was flanked by multiple defensive backs and should've been tackled, but somehow scored a touchdown.