I don't think this is fair.
JJ is merely the latest victim of an SU hoops coach putting him in a position that's too expansive for his abilities. (see: Girard, Joseph)
He's a sloppy player who shoots poorly from deep and plays mediocre-to-lousy defense. However, at his best he's a very good slasher. If he were, say, the 7th man who got 15-ish minutes per game (20 when he was hot), then he'd be a useful piece on a very good team.
Better coaches would have had him playing better D, and kicking more often on his drives to strong 3 point shooters. But he's never played for a good coach here.