Its a lot of things.
#1 losing the best most dominat Def tackle in the game,alber haynesworth wrecked havoc evey play,clogging up the middle and demanding 2 least 2 guys blocking him, that frees up a lot of space for other defenders to make plays.
Injuries to CB.especially the pro bowler finnegan.
Kerry collins being kerry collins.
No playmakers.deer threat @ WR
Chris johnson everyone knows about now.
The bottom line is they just arent sneaking up on anyoe as they did last yr, to me not playing as physical and losing haynesworth would change any team. Nobody could run up the gut against them w/ his big ass there.