As someone who has gotten killed for being critical of JG3, I'd break him down as follows:
Pros
-great shooter off the pass and when open, set and not fading or off balance
-great free throw shooter who hasn't always been great at the line at the clutch but came through last night
-good option late in the shot clock when everything breaks down as he can hit tough shots
Cons
-lousy ball handler who has trouble getting the ball over half court against a ACC level defender
-often guilty of taking plays off defensively with poor closeouts with no hands up and doesn't always run back on defense, there is no excuse for poor effort
-often poor shot selection and often early in the shot clock and insane heat checks. It feels like if he makes a shot we have to pay a heat check tax.
-dribbles the ball into the ground trying to beat guys off the dribble and ends up killing the shot clock and hurting our chances to get a quality scoring opportunity
Joe has been hurt also by JB not giving him breaks to save his legs and also help him handle his asthma. He also is a 2 in a one's body. As I've said before if he only took good shots and showed more hustle on defense, his other shortcomings would be overlooked and he would be far more popular and ultimately more effective. When he takes open shots with his feet set and body square he is an absolute weapon. But if you are going to compare him to Gerry, I don't recall Gerry ever giving questionable effort nor do I recall him turning the ball over as much as Joe does.