D'Antoni - Has underachieved everywere he's been
Doc Rivers - Could only win with an All Star cast.
SVG - Clearly underachieved with a couple Dwight teams.
Mike Brown - umm.
Larry Drew - can't do anything with very talented teams.
Carlesimo - Has gotten fired from every single team.
Byron Scott - Can't do anything with the best point guards in the game at the time.
That's just a start.