In my many years of watching college football, I don't recall a team so spectacularly different on both sides of the ball then this Iowa team. This team has one of the best defenses I've ever seen. They don't beat you with talent, they beat with being in the right place and reading the play from the opponent. They don't make mistakes. This team knew where to cover Michigan's WR and TE's. They knew where Blake was going to run, they pressured JJ, and they don't miss tackles. Michigan managed to gain only 213 total yards.
The flip side is they are just as bad on offense.