if there is one thing they do well in college it's play defense. it's really hard to score in college basketball - mostly it's really hard for freshmen to score in college basketball. there is a reason you see routinely see scores in the 50s and 60s and their are three people in the country averaging over 22 ppg. three dudes who average more than 22 ppg. and there is a reason a guy like Cam Whitmore with all his tools, is only averaging 13 ppg (on worse efficiency than Miller)
there are six guys from power conferences averaging 20+. one of those is brandon miller. the other five are all juniors and seniors. among those six players, only Zach Edey (who is 7'4") who only shoots within about 5 feet of the basket is more efficient than Miller.