Well, there are a lot of ways to compare how "good" a coach is. Here's one way:
http://www.coacheshotseat.com/WinningestActiveCoachesIA.htm
Urban is #1 among active coaches in career win-loss record (coaches that have coached for more than one year)
1) 84.7% Urban Meyer
2) 82.5% Chris Petersen
3) 80.4% Lance Leipold
4) 79.4% Jimbo Fisher
5) 78.1% Nick Saban
Urban is #1 among active coaches in current school win-loss record (coaches that have coached there for more than one year)
1) 89.5% Urban Meyer (6 years)
2) 87.0% Nick Saban (11 years)
3) 83.3% Paul Chryst (3 years)
4) 81.0% Mark Richt (2 years)
5) 79.4% Jimbo Fisher (8 years)