21. Steve Wilks
Wilks has worked with an impressive number of schools over the years. His resume includes runs at Notre Dame and Washington before he stepped up to the NFL. After a few years as a defensive coach with the Panthers, he enhanced his reputation. Finally, the Arizona Cardinals offered him the coveted position as their head coach but it didn’t last for long.

Everybody respected him but he didn’t do a good job. The team had the worst defense in the league and ranked 20th in offense (via USA Today). Wilks was a superb professional and his players genuinely liked him. But the problem was the product on the field. They didn’t deliver and finished with a 3-13 record. After Arizona fired him, he went back to college with the University of Missouri.