Any Michigan fans on here, or fans of Levert with inside info.
Just use the search function on the forum for Levert and Saltlover and you'll find all my scouting reports on him going back to his sophomore year. I've been high on him since fall of 2013. It's unfortunate he got hurt last year, but he's really taken his game another notch up from prior years, and is really able to drive to the basket much more. He's a jack of all trades player. His upside is good Evan Turner with a better 3-point shot. He does have some bad Evan Turner in him as well (forces the issue too much and goes on tilt with his jump shot, and then passes it we're not quite sure who). But Michigan's top 2 point guards have been out much of the season, so I think he's getting accustomed to having the ball in his hands so much.
He's also a really good kid. Michigan is a big school, and people are willing to call out players who are jerks, even if they're star players on championship teams (ahem, Brian Griese). Levert seems to be liked by everyone. There aren't stories of him saving people from burning buildings -- just that he's a genuine, sometimes quiet, kid at college. He's got great work ethic, which is probably how he got his injury (from working out too much).
I'd be really happy if he became a Celtic. I don't think he's got star potential, but he's the type of player that every team needs. He can fill multiple roles on offense and defense, is a good teammate, and you don't have to worry about him at 2am. A fine pick in the 10-20 range. Some team will be happy.