As a Michigan fan, I've seen a lot of Levert, so here are my thoughts:
Firstly, I don't expect him to be available when the Clippers pick, unless there are serious issues with his foot (which there may be), in which case I unfortunately think the Celtics should pass on him in the first if true.
That said, assuming he's reasonably healthy, I'm not completely sure he has All-Star tools. He's got a very diverse toolset, but I don't think he projects to be a #1 option, which is what you think of when you think All-Star. His biggest issue is strength -- he's still a beanpole, and even in college has issues finishing at the rim. He can get to it well enough, but if he can't finish, he's forced into more jump shots. He's long, athletic, a good spot-up shooter, a decent pull-up shooter, and a good passer/balhandler for someone who projects as a 2/3. But if he's limited to being a jump shooter, that will take away some of the benefits of his penetration ability.
Defensively, while he does put up nice steal numbers, it always felt like he got those because he's got long arms and is pretty tall, and so intercepted a lot of half-court passes that were poor decisions in college but wouldn't be attempted in the pros. I rarely saw him make those steals as the result of taking someone's dribble in a 1-on-1 situation. Michigan also often employs a trapping 1-3-1 zone which led to some easy steals as well (which is a great system to use in college when you've got a guy like Levert, but isn't used in the NBA because that's just going to lead to a dunk.) As a one-on-one defender, he seemed to rely on his length, but not any real technique. When he's in the pros and length alone won't cut it, it's not clear he'll be great at defense. We've seen this problem with James Young, although I think Levert is a little better at team defense concepts.
Some may also say he wasn't able to carry a team, as he sometimes struggled this year while being asked to lead Michigan. Doesn't have that "it" factor. I don't really buy that argument so much. When he got hurt, he led the team in points, rebounds, assist, steals, blocks, 3-point % (for players who'd taken more than 4) and attempts (ie he had both good efficiency and at a high volume). Michigan wasn't a great team when he was their best player, but they're 3-8 since he got injured compared to 11-7 when he was playing. The team around him was very limited.
He also has added to his game as he's been in college. As a freshman, he stood in the corner for the 3. That was it. As a sophomore, he was more of a secondary ball-handler and still largely a spot-up shooter. This year he showed he could be the primary ballhandler, and could create both his own shot and shots for his teammates. He's been a very hard-worker (unfortunately his extra work in the gym may have led to his foot injury). I do think he can be a very versatile #2 or #3 option in the NBA. He has the potential to be great defensively because of the problem his length can cause on the wing, but I don't think it's guaranteed. But the biggest thing, aside from health, is strength. He's still young (turns 21 in August, and is younger than a lot of sophomores), so maybe his body can keep developing. But there's a very real chance that he won't be strong enough to ever keep up with the competition. And that's why a bouncy wing who's 6'7" with long arms and can shoot, pass, and dribble was projected in the 10-15 range instead of the top 10 before he got injured.