People would still cry. I think the ult should not go further out then the animation.
But besides that. People say he is broken because of his play style. He could use some tweeks. Many champs could. But it's because people can't catch him to beat him is why they say he is OP.
No one wants to use lobo chain or zatana slow or adjust there play style for one champ. Even though one item could make flash the most pointless champ on the roster, if it messes with people build they don't want it.
I see flash as a squishy and I know I can kill him before he kills me then idc. If not. Neron contract. (Or other artifact) Hit one or twice then set Neron when he comes in and all he has left is a weak melee and cool down. Rinse repeat. That's just a general idea of one way to stop him alone.