Was the Saints offense THAT bad, or was the Ravens defense THAT good?

Baltimore is arguably the best defense in the NFL. The year they won the Super Bowl they were arguably one of the top 5 defenses ever. This defense ins't nearly that good, but they are still one of the 2 or 3 best in the NFL.

I mean look at the state:
3rd in yards per game
2nd in yards per play
2nd in first downs per game
2nd in turnovers created
1st in interceptions
3rd in scoring defense