What's so terrible about it?
Cignetti is hard to argue against given that he took over a bad team and won a championship.
Coaches that walked into a top program and have maintained are harder to judge because it is hard to say how much of their success is due to coaching and how much is due to almost always having a talent advantage. I don't follow other teams enough to say how good the list is overall. It includes the coaches that are often seen in other lists of top coaches.