Curry is just a good shooter
He's in a different league and not "just a good shooter", he has greater range, for one, and he can do pull-ups step-backs, catch-and-shoots, you name it. He handles the ball better than AI, has great positional awareness, and has an FG% better than volume shooters like Michael Jordan, Kobe, and DWade.
He doesn't jump particularly high and he's not a showtime dunker, but his ball handling and shooting skills (in addition to accuracy) combined are unprecedented.