Cox is one of the most polished hitters in the draft. Some of the other draft experts have cited that he won't have enough power to be a 3B in the majors.
What I see is a successful power hitter who reworked his entire approach after his sophomore season to hit for average and succeeded. It tells me that he can make adjustments against good competition and will do so at the next level. I like him.
Floor of a part time player and a ceiling of a solid starter. Not a superstar though.