The Lions annihilated the Vikings in the 2nd half yesterday with a steady 1-2 punch of Calvin Johnson and Pettigrew. They could not get anything on the ground against the Vikings D, but with those two huge pass catchers and Stafford getting solid protection (mostly), they didn't have to.
Our D is very similar to the Vikings... solid against the run but inconsistent against the pass, meaning they can't always able stop 3rd downs when they need to. Also, the Vikings beat themselves a lot yesterday, which we also have been doing a lot of on both sides of the ball.