I guess this depends on your scoring system. In my custom scoring system, the Skins are 14th:
TD10 Miami Dolphins 4 12.6 64.3 76.9 1.0
TD11 Tampa Bay Buccaneers 10 11.1 65.4 76.5 1.0
TD12 Minnesota Vikings 8 8.6 66.2 74.8 1.0
TD13 San Diego Chargers 9 10.1 64.1 74.2 1.0
TD14 Washington Redskins 10 7.4 64.3 71.7 1.0
TD15 Dallas Cowboys 10 9.2 60.1 69.2 1.0
Maybe your scoring system rewards things the Skin's are good at? Maybe yards allowed, or points allowed are more valuable than interceptions/fumbles/etc.
Standard FBG scoring has the Skin's 12th:
165 Def10 Def10 Green Bay Packers GB/8 31
171 Def11 Def11 Carolina Panthers Car/9 25
177 Def12 Def13 Washington Redskins Was/10 19