Noel is one of the most overrated players in this draft. His offense is way too fundamentally flawed at this point to expect any sort of reasonable growth. His defense is praised as "NBA-ready", but that's only rim protection and help D. When it comes to individual man-on-man, his skinny frame is going to get eaten alive in the NBA. The dude's ceiling is essentially Ben Wallace. That is no where near a #1 overall pick in my opinion.
As for Shabazz, I actually watched every game of his in Westwood this year. I know Howland's system always depresses the stock of his talents (Westbrook, Love, etc), but Shabazz truly looked like an awful player. First of all, he truly is one-dimensional. Considering his sheer athleticism, it's worrying how poorly he took advantage of it. His defense is underwhelming, he can't get steals/blocks, he doesn't pass, and although his rebounding is underrated, that's basically it. As far as his "strength" in scoring, his offensive repertoire really did not blow me away at all. And for all of the talk about him having a "killer instinct", it was often Jordan Adams and not Shabazz Muhammad pulling out the big plays.