Two of the things you would expect out of a good pass defense would be sacks and interceptions. Well, neither the Eagles nor Saints have been very good at either this season.
They each have a combined total of 16, which is near the bottom of the NFL. And keep in mind, the Eagles had four picks in Week 1. The Saints don't have four picks all season (3).
Here are the defenses with the most and fewest big pass plays entering Week 9: