When he plays well, I get why everyone loves him, but in the Illinois games I watched (about four or five), he disappeared for long stretches of time. He'd dominate for five minutes, but then do nothing, offensively or defensively, against teams that were really outclassed in the middle (Michigan and Purdue.) Some of that may have been coaching, some of that may have been teammates, and some of that may have been the death knell following the Illinois program around the second half of the year, but some of it had to have been on him. 6-foot guards dribbled into the lane, and he didn't try to contest. Power forwards playing center, who will never get a sniff of NBA interest, could keep him from getting position in the post. And it's not because of his ability, but something about his motivation.
Again, I saw only a few games, and they were in the second half of this year when his team stunk, but at the same time, if Meyers Leonard had given max effort while he was on the court, his team wouldn't have stunk, because he can be dominant.