I haven't seen Juwan Howard coach yet but I expect him to be no better than mediocre long term.
Of the returning coaches, I think Pitino is the worst. Chambers gets his team's to play hard but he struggles to pull out wins. Collins is better than his record, I think he has been above average. Fran is pretty good at both recruiting and establishing strategy. If you are a "roster build" guy, Fran has been good.
In the same light Underwood and Holtman have really recruited well. It should start to pay off for Underwood this season. Painter probably has the best offensive system in the Big Ten right now, and his guys buy in and play defense. Miller has been one sided as a defensive coach but he has had to undo a previous system of sloppy basketball. I will say that I believe Miller's man offense is bad. The high weave with the double screen on the ball- it never works. If that is based on personnel, then it must begin to change this year (3rd).
I really like Rutgers philosophy of play, sort of a no holds barred, just play hard,approach. But they have a long way to go to prove anything. Hoiberg has had success and he will have resources at Nebraska. We shall see. Gard did a great job taking over for Bo but so far he hasn't recruited quite at the same level. But Wisconsin plays a brand of basketball, and that comes from good coaching. If Gard is good, this year will prove it. Personally I don't think they will have the inside threat to command doubles this year, so if he doesn't get something going outside he won't get the job done.
Izzo has been exceptional as a coach for his entire career. No question there.
I don't think it is that easy to rank them, but Pitino, to me, for the talent he has brought in, has not been as good as he could have been, so I rank him lowest.
I would say the same about Turgeon, but at least his team's are top 4 or 5. He gets them in the tourney.