Is there a player in the league you'd compare him to? Tell me why he isn't Jon Diebler.
Chris: Not Diebler - much stronger, better defensive fundamentals, more versatile offensively. Let's get the Klay comp out of the way, because of the Tony Bennett connection and because Joe's made this comp himself (great branding, Joe!). It's not absurd, as neither of them has median NBA athleticism and both are bigger guards. Klay's longer and was smoother driving and finishing toward the basket, but Joe's stronger and more comfortable with his back to the basket. Klay was a touch more athletic which is significant as you approach the margins, but you can dream a little on that comp if you want.
No perfect comps, but here are a few I like offensively: Overall ceiling is basically Afflalo. Offensively they're similar between the restricted area and 18'. Joe's worse around the rim, upside to be better as they approach the arc. Joe's better at moving without the ball, a serviceable ballhandler but even less effective creating off the dribble than Afflalo. Both are similarly challenged defending quicker players, have similar size, and would likely draw the same defensive matchups. The offensive value of either guy turns more on the players around them than you'd like. Jay Bilas has compared him to a stronger, more athletic JJ Redick; that's a pretty good comp. He's much less assertive dribbling the ball (will that change in the NBA?) but already a more efficient mover without the ball than JJ, especially going around flare and pin-down screens. If he's going to make it, his shot will have to translate like JJ's did. They shot the same in college from 3 but JJ took more/dumber/harder shots, so JJ's shot tool was probably ahead of Joe's from draft night to draft night. Sounds like Joe's been working on it though.
Defensive comps: My best guess defensive comp is Aaron McKie in a less favorable defensive environment for his tools, so more of McKie's old stops will be fouls on Harris, but his positioning will be good and he'll surprise you with the occasional disruptive play on defense. "36-year-old Ray Allen?" is a sneakily good worst-case-scenario comp on defense. Joe works well in a defined role of an effective system, does not have great quickness so he will get blown by, but is strong enough to slow faster guys down just enough for help to come. So yeah, Aaron McKie and Ray Allen comps, exactly what you expected.