Against the Packers. Holding them to 14 points is a good thing. Should never have come down to holding a lead. The defense did their job almost all day.
Texans and Colts games, yes it's their fault though that Forsett TD sure wasn't in an OT game.
Vikings and at Bears, Chicago home, not their fault and even the Cards game was all turnovers.
Falcons and 49ers outmatched and pretty injured in both games. at Vikings, Peterson got them.
at Titans they gave up 23 really, somewhat their fault but they made some big plays, Houston turnover. 20 on the road to the Packers, somewhat their fault.
5 games not their fault (many divisional games). 2 only somewhat(at Pack/at Titans) and Houston you have the Forsett TD when the Lions were cruising.
3 losses only you can pin solely on the defense out of 12 and even in those games the offense did things to screw the defenses.