From nbadraft.net about the Nike Hoops Summit game and practice:

Some thoughts on McGary.

"Mitch McGary, C: The big lefty who burst onto the 2012 recruiting scene this past summer showed he is definitely far from a finished product. After going from relative unknown to garnering comparisons of Tyler Hansbrough, McGary came back down to earth once he got to the more organized play of his Brewster Academy prep school. Mitch’s motor was advertised as being non-stop, but have yet to see that and have yet to see anything close to the ability of Psycho T. Mitch is a decent athlete and has good size, but he went with the trend of staying more out on the perimeter, shooting brick after brick. People also commented on his constantly hanging on the rim after dunks, almost seeming like he wanted to duplicate the broken backboard at the Elite 24 this past summer. The thoughts on McGary seemed to be that he was maybe unfairly hyped up and ranked. Also heard rumblings about the fact that he is close to a year older than anyone on the team (with Kaleb Tarcrewski being the next oldest and 8 months his junior). Michigan gets a big body and I am guessing Mitch will eventually be a factor, but he seems like a long-term college player. To those saying he was a better version of Tyler Hansbrough, he may have more size and upside, but he shows little of the drive that made Psycho T a 4-year All-American at the NCAA level."

And on Gary Harris:

"Gary Harris, SG: He is not incredibly flashy and seems to be mostly about handling business rather than standing out. Harris still looks like a good scoring grab for Tom Izzo and Michigan State with a nice fluid shot. The youngest player on this team (with Goodwin being one month older), he still seems confident in his abilities and might have had the most points in Friday’s scrimmage besides Shabazz Muhammad. Seems like a solid long-term college player and someone who Tom Izzo could work with to get to a pretty high level when it is all said and done."

More on McGary from another basketball writer:

--"USA centers Kaleb Tarczewski, Mitch McGary, and Tony Parker were all complete non-factors who did nothing positive. The three played a total of 22 minutes and scored 2 points (1-for-5 shooting), grabbed 1 rebound, and blocked 0 shots. McGary is certainly a spirited cheerleader on the bench, but he committed 4 boneheaded fouls (only 3 on the official tally, but I remember all 4) and missed at least 5 dunks in warm-ups, so I question where his head is and how much he’ll develop in college. "

Robinson is a stud, I almost like him as much as Harris, but do not get your hopes up for McGary, he's really not a very good athlete and looked like he didn't belong out there in that game.