Ben Fawkes has an ESPN Insider piece discussing the Chicago Bears significant flaws. A taste:

The Chicago Bears had a surprisingly successful season last year, winning the NFC North with an 11-5 record and earning a bye in the playoffs before losing in the NFC Championship Game to the Green Bay Packers, the eventual Super Bowl champions.

With a (possible) franchise quarterback in Jay Cutler and a perpetually strong defense, expectations are high in Chicago for this coming season. But should they be?

In reality, the Bears are a deeply-flawed team and last season's success -- including five games won by five points or fewer -- masked Chicago's true deficiencies. This year they will be hard-pressed to duplicate last season, and make it back to the playoffs.

There are several reasons. But they boil down to the Bears' offensive line issues, a lack of offensive playmakers and several intangibles working against them.