It wasn't so much the offense as it was the complete lack of emphasis on defense and especially rebounding...
The offense was one of the best in the conference toward the end of BC's tenure. I have, and still feel, it was an advantage. The defense, however, was way up and down. The 1-3-1 could completely throw opponents off at times (especially with the right personnel at the top - Nash, Cobb, Hachad), but often quality teams would decimate it with good passing leading to wide open corner 3s or dunks. The base man defense we ran was never that effective, partially due to recruiting/physical development of the players. To his credit, Carmody did try to implement a variety of different strategies to counter this issue over the years. (1-3-1 ameba variant and even a 2-3 zone).
Rebounding, to put it lightly, wasn't good.
...when a recruit like Henry Ellison shows up on your doorstep, you really have no business coaching college ball.
Pretty sure you're referring to Frank Kaminsky. Perhaps, BC didn't think he was a good fit, but it turned out that was a massive mistake and furthermore, not a good look for the program.
I believe BC was on Ellenson early with Hardy as the lead recruiter up to the point of his departure for Georgetown.