I'm sorry, but what does it matter? I know that D3 hockey is good hockey. But if your kid is playing D3, he ain't going pro. As such, why does it really matter how good the coach is? I would just want to make sure he isn't a dick, a psycho, or someone who will prevent your player from focusing on his academics. Your kid is in college to get an education ... hockey being only a nice extracurricular activity.
Our oldest has loved his time at Umass Boston, very well run program, coaches are very good to the players. Head coach is the son of a RI coaching legend.