The Tampa Bay Buccaneers have been trotting out the statistic that their defense is ranked fifth in the NFL. That sounds good, right? But the NFL's official rankings are based on total yardage, and that's a pretty terrible way to measure defensive quality. One reason the Bucs defense allows so few yards is that the offense has been one of the most turnover-prone in the NFL, giving opposing teams a short field but frequent scores -- only four defenses have faced worse average field positions. Teams can't rack up yardage if they're in the end zone, after all.