I think solid is the right word. He isn't very natural offensively from what I've seen. He is very good at challenging shots with his size and strength. I think it would have been nice seeing him playing at the 5 with Simms at 4 for a couple of years there.
He left because BB plays midmajor basketball and would not develop inside players. Jemison was developmental and needed a few minutes a half to develop. Even if he simply rebounded and blocked shots. Hall is the first post player as a freshman last year. Imagine how good hall could have been if BB had given him more minutes last year. While Hall improved, maybe he was good last year and simply needed game time and coaching.