It's ugly, so very, very ugly.
Worst Pass Defence in the League - 3130 yds (remove Philadelphia and no one else is within 600yds)
Second worst Rush Defence in the League - 1268 yds (3rd worst is still 100yds better).
20 passing TDs allowed (2nd worst)
11 rushing TDs allowed (5th worst)
It may only last one year - 2013 Dallas Cowboys on track for 7000+ total yards conceded.
Make all the excuses for Kiffin that you want - but no defence EVER has been this bad. I'm sure that in the history of the NFL, plenty of coaches have had similar injury problems. Time to accept that this simply isn't working!!!