The ones that dream of Gruden coming to UT are the same losers that fantasized about bedding down the homecoming queen but only ending up with a sticky wrist.
Winning the SuperBowl doesn't mean you're the greatest coach ever, but I think it qualifies to say you're not a bad coach. Break it down, how many head coaches have led teams to winning the SuperBowl? I'm guessing the number would be in the 30s considering the multiple winners. So yeah, there are better coaches out there, but Gruden is far from a "bad" coach.