People are led to believe he is better than he is because he tells them he is.
Over the last 4 years, the 'defensive genius' coached a defense that 21st in points allowed, and 29th in takeaways.
For some reason people think his false bravado makes him a tough guy who scares offenses, but the facts don't back it up.
That is just his over rated dynamic as a defensive coach. When you add in the awful leadership skills, accented by making stupid claims he can't back up (how many SBs has he guaranteed so far) having locker rooms that are divided more often than cohesive, players quitting on him, a terrible job of personnel evaluation, and a lack of knowledge combined with disinterest with the offensive side of the ball, why is anyone surprised that he hasn't have a winning season in 4 years?