To those who seriously ask if Gruden is a good coach or try and imply he wasn't good in the NFL....
The Raiders were a disaster area on the Dooley level before he arrived. The Raiders had just finished 4-12, in last place in the AFC West. Al Davis was a known psycho and terrible owner. Within 3 years the Raiders went from last place to 1st place in the AFC West. The Raiders hadn't made the play-offs since the 1993 season. In year 3 under Gruden they lost in the AFC Championship game to the SB champion Ravens. Rich Gannon had been a flat, average or below average QB everywhere he went. His production essentially doubled in Gruden's system. He went on to 4 Pro-Bowls and the NFL MVP award in his mid 30s once he got with Gruden. Al Davis traded Gruden to Tampa Bay because his contract was coming due and Davis didn't want to spend the money to keep him.
Tony Dungy had built a good defensive team in Tampa Bay but was trending down. He hadn't built some juggernaut like some here seem to think. He went 11-5, 10-6 and then 9-7 in his final season in Tampa. He coached them in 4 playoff games but Tampa only scored a total of 32 points in the 4 games. His offense was bad, especially in the playoffs. During this time Tampa was spending money like crazy trying to win the Super Bowl. Their salary cap situation was a disaster and they were going to have to cut bait by the 2002 season. So they went all in on Gruden with the trade to Oakland. It worked. Tampa improved from 9-7 to 12-4 in Gruden's first season. Tampa scored 108 points in their 3 playoff wins. They tied the 1992 Dallas Cowboys for largest margins of victory in the free agency era in the playoffs.
Then the cap issues hit. The owner acknowledged this and knew times would be getting rocky. Gruden got the Bucs back to 11-5 after two down years. There were still cap issues even then.
At the end of his 11 seasons, he'd finished in 1st place in his division 5 times. His .540 winning percentage is actually 26th all time in the Super Bowl era of coaches who were in the league more than 10 seasons. Higher than guys like John Fox, Tom Coughlin, Dan Reeves, Lovie Smith, Jack Del Rio etc who have at minimum coached in the Super Bowl and in the case of Fox and Coughlin won 3 between them.
Would he be a good college coach? Highly likely because he was a very much above average coach in a much tougher setting.