this is a tough argument because not all are exactly rated or talked about enough to be on the list and these are just my opinion, so feel free to give your opinion as well and name your coaches
Overrated:
Les Miles (no doubt this guy is at least smart enough to put good quality football minds behind him because he is about as sharp as a marble) there are obviously many worse coaches than Les out there but they don't get the media coverage and hype his team gets every year being in the SEC so Les gets my vote
Underrated:
Gary Patterson (all he does is constantly rack up double digit win seasons with a state dominated by A&M, Tech and Longhorns with recruiting) he never seems to be mentioned for the big jobs and the guy can just coach, he just wins games