Everything mentioned here by jonathan givony was correct - http://www.draftexpress.com/profile/Jahii-Carson-6529/
Some excerpts below;
Carson had one of the highest usage rates of any player in the nation last season at 31%, which ranked fourth among players in our top-100 prospects. He struggled from two point range, converting only 44% on these attempts (third lowest among collegiate Top-100 prospects), but he was relatively effective from 3-point territory, where he shot 39.1% on three attempts per game.
That 3pt % dropped with the extended FIBA line.
Where Carson must improve is with his off the dribble shooting, as he converted a paltry 31% of these attempts (26/84) last season according to Synergy Sports Technology. His lack of size makes it difficult for him to get off clean looks, but he will need to find a way to punish defenders going under ball screens to cut off his driving lanes, something he struggled with quite a bit in college.
Very ball-dominant in his two seasons at Arizona State, Carson struggled to show translatable point guard skills on a consistent basis. He had trouble distributing the ball to his teammates, often struggling to make even the easiest of passes around the arc by putting either too much force into his passes or lazily throwing them in difficult places to catch.
Carson will likely struggle defensively in the NBA, due mainly to his size limitations but he doesn't put out consistent effort to make up for his deficiencies.
There are also some question marks regarding Carson's character, as he reportedly did not always see eye to eye with the coaching staff and has developed a bit of a reputation for not being a great teammate.
He has a bit of an uphill battle at this stage and won't get the benefit of being considered to have upside to grow into, despite playing only two seasons of college basketball, as he turns 22 in August and is thus the same age as many seniors in this draft.
I'm kind of schocked that the Hawks and Geordie recruited this guy.