That's selling those teams a bit short. They were low on defensive talent but they had good schemes and played hard. Went up against a Cam/Dyer combination that had averaged 40+ppg in their SEC conference games, and then held that squad below 20 until they broke one of the luckiest plays in NCG history (plus wrist was down). Against Ohio State in the Rose Bowl, Kansas State in the Fiesta Bowl, Texas in the Alamo Bowl, and Florida State in the Fiesta Bowl, the defense played somewhere between good and great, especially considering the personnel.
Looking at those offenses though, the lack of talent is striking in retrospect. Here are the skill positions for the 2011 NCG against Auburn
QB Darron Thomas - undrafted, never played
RB LaMichael James - drafted 2nd round in a huge mistake, only gained 193 yards in the pros for his career
RB Kenjon Barner - drafted 6th round, only gained 403 yards in the pros for his career
WR Jeff Maehl - undrafted, bounced around practice squads
WR Lavasier Tuinei - undrafted, bounced around practice squads
WR Drew Davis - undrafted, only had 256 career receiving yards
TE David Paulson - drafted 7th round, only had 153 career receiving yards
There wasn't a single legitimate NFL talent on the field and they still came one play away from going to overtime in the title game.