I don't know how much control he had, how much of the problem was the GMs, but he did win a Super Bowl. He made it through a regular season + playoffs against teams who ran his system led by a coach he taught it to.
And if he was so bad about evaluating players, why did the Raiders make the Super Bowl right after his tenure there :shifty:
Personally, I do not think he would be a good fit at a college program, regardless of what kind of success he had in the NFL.