Some things
-Tell us about his recruiting and if he has had any success acquiring national talent, 4 stars etc.
-Also about his system- many of us have not been happy with the recent SJU systems of just heaving up the 3 balls with little attention to a front court and poor rebounding. I fear he is more of the same- you cannot win in the BE consistently (or nationally) with that system.
-Why have bigger programs largely avoided him?
As you can imagine, even before the drop off to low rankings for the conference, it is very hard to recruit a 4 star recruit to the MAAC. And a 4 star big man, forget it. There just aren't that many tall people to filter down to the MAAC level who are also really good at basketball. If you are 6'10" and a top level recruit, you aren't going to the MAAC. In my time following the MAAC, I cannot recall any team signing a 4 star recruit. Iona did get MoMo Jones who transferred back from Arizona and who was ineligible for some reason to transfer to St. John's.
Cluess played a very fast, up-tempo style at Iona, frequently pushing the attack,running after made baskets, etc. Some of that I believe was to neutralize Iona's lack of size against longer/bigger opponents. It is also his preferred method of playing. I think Cluess's ideal team is five 6-7 guys who all can handle the ball and are interchangeable on the attack. I don't think he likes the traditional half court offense with a big post player.
Defense at times appears to be an afterthought as I believe he'd rather simply outscore you and win 85-75, than play a traditional style. He can coach defense when he has to, though, and did this year with a depleted roster that didn't have the shooting skills of his previous Iona teams. He does love shooting three's in transition and Iona practiced with a 10 second shot clock. Players have to be extremely physically fit in this system. It can be fun to watch and breathtaking at times when the team is in sync. As you point out it is a big question whether this style translates to success in the Big East. He'll have to determine that early on and I believe, while he can be stubborn, is able to adapt to situations.
Bigger programs have made overtures regarding hiring him while at Iona, as I understand it, including Rhode Island, and he did have a flirtation with Hofstra (mostly because of location I believe), but, as you can see if you read the story I linked, he's a devoted family guy and did not want to leave the area with his kids in school here. I think they are in college now. The one job Iona fans always thought he would take, and we wouldn't begrudge him for taking, is the St. John's job. It is kind of like coming home for him.