Jaylen Brown reminds me of guys like Tyreke Evans, James Harden, Dwyane Wade, and -- less flattering comps -- Tony Wroten, Terrence Williams, and Shabazz Muhammad.
Basically, I feel confident watching him that he'll be a scorer who can get to the rim. He looks like he's got an NBA body already, he moves well, and he looks like he has a pretty good handle. He'll probably rebound well for his size.
Main questions are, can he defend, can he pass, and can he shoot? Answer yes to at least two of those questions and he's probably a very good player. If not, well ... borderline rotation player.