Joe Gibbs doesn't get the credit he deserves. Winning three Super Bowls with three different quarterbacks.
Or Bill Parcells, Im still stunned that he beat the Bills in that Scott Norwood Super Bowl
Gibbs gets a more subtle respect. He's not a flamboyant figure, but as a longtime Cowboys fan, I can tell you, we KNOW how good Gibbs is. I think Gibbs accomplishments are particularly impressive when you consider that he never had great players. He had a lot of good players, but Riggins, for example, is seldom mentioned among the all-time great running backs (I think he's probably underestimated a bit, also). But Gibbs, like you said, won three Super Bowls, without doing it like most coaches, who built one team and were able to hold it together for a decade. He made tremendous use of role players, and really redefined offensive line philosophy.