He should do something more related to his character. Any of the ninjas could throw a shuriken. In fact, almost every character can throw random things.
I mean, Garen spins because Garen, Kat spins because Kat. Why does Zed throw that 'eh' shuriken when he could do something... zeddier?
He could use his ultimate and... ok the original could be OP. But he could use something that looks the same and acts differently. He just has to disappear, put an X on something and appear behind it, and then SPRFT. That'd be way better imo.