Just take the last 6 years NCAA tournaments and compare winning percentages. This is the bottom line in NCAA basketball. I think Tennessee was 9 and 6. If a coach had a team that did not make it one of those years then they are out of the comparison or just give them a loss for that year in calculating the percentage. Take the winning percentages and see where he sits. If he sits in the top ten then he is a top 10 coach. If his winning percentage is not in the top 10 then it is a valid point that he is not a top 10 coach. If it is, then it is a valid argument that he is.
Here is a list of coaches and their winning percentage in the NCAA tournament from 2008:
1. Mike Krzyzewski, Duke, 69-21 (.767)
2. Billy Donovan, Florida, 22-7 (.759)
3. Rick Pitino, Louisville, 34-11 (.756)
4. Tom Izzo, Michigan State, 26-9 (.743)
5. Roy Williams, North Carolina, 47-17 (.734)
6. Steve Fisher, San Diego State, 20-8 (.714)
6. Ben Howland, UCLA, 15-6 (.714)
8. Jim Calhoun, Connecticut, 41-18 (.695)
9. Tubby Smith, Minnesota, 29-13 (.690)
10. John Calipari, Memphis, 20-9 (.689)
11. Bill Self, Kansas, 18-9 (.667)
11. Thad Matta, Ohio State, 12-6 (.667)
13. Gary Williams, Maryland, 27-14 (.659)
14. Bruce Pearl, Tennessee, 7-4 (.636)
15. Mike Davis, Ala.-Birmingham, 7-4 (.636)
16. Jim Boeheim, Syracuse, 40-24 (.625)
17. Bruce Weber, Illinois, 10-6 (.625)
18. Bo Ryan, Wisconsin, 10-6 (.625)
19. Rick Majerus, St. Louis, 18-11 (.621)
20. Eddie Sutton, USF, 39-26 (.600)