Maybe it's time to rework it.
AD Ezreal playing without W wins more games than AD Ezreal playing with W.
Source: Champion.gg
edit: Moral of the story for those who don't get it: W is fine on AP Ezreal, but needs better utility or higher damage on AD Ezreal. Most of the times it feels really underwhelming and gimmicky, so much that players are avoiding to pick it until they can and they're having better results than those who unlock it at level 4.
E (although it's pretty terrible)
Q