For a guy that was talked about being the first pick of the draft in most of the early mocks, Sarr has been really underwhelming. Seems to be a plus athlete, and a good handle for his size, but not enough to make up for the general lack of instincts out there. Maybe he can be coached up, but just a really raw player now.
He was drafted that high not because of the player he currently is, but the player teams think he can turn into down the road. High risk/high reward, as there is no guarantee his potential will ever be realized. But definitely a very rough start to his NBA career.
With a player like Clingan, the risk is much lower as he has a high floor and even if he only ends up doing 1 thing really well in his career (lockdown defense in the paint), that is still enough to be an important contributor on a winning team. And if he is able to develop other areas of his game (post game, 3-pt shot, etc), he'll be that much more of an impact player and possible All Star some years.
Castle is in a similar boat to Clingan (high floor) but has an even higher ceiling as if he ever develops a consistent 3-pt shot, the sky is the limit.