One NFL team ends each season as champion, but for the other 31 teams, the season ends up defined by their flaws. The outcomes of games hinge on what a team can't do well just as often as they hinge on what it can do better than most others.
Halfway into the season, it is painfully clear what the No. 1 obstacle to success will be for teams around the NFL. What problem areas are the biggest red flag for each NFL team?