A few relevant statistics about Chris Holtmann and his relatively brief head coaching career: in six years, he's managed to lose fewer games than the previous year in every year except one, in which he lost 11 games in consecutive seasons. In his first year at Gardner-Webb, he only won 11 games, and two years later he wrapped up a 21 win season. At Butler, he always won at least 20 games, and this past season notched a career-high 25 victories against a career-low nine losses.
You probably already know a lot of this; more than anything, those wins and losses are the overall criteria with which we judge a coach, particularly a new one that we don't know a ton about.