He obviously had some potential as he came up through the Feyenoord system for 7 years and then the Nike Academy before signing for Wolves. While fans love to think they know all about players, I'm pretty sure the coaches and clubs involved in his early development know more than me.
It may well be that he doesn't fulfill that potential, but I doubt he's completely useless.
Robinson likes speedy players because you can coach fast player to pass a ball, but you can't coach speed into ball players. It may not have worked out in this case, but I hope we stick to this approach as I enjoy seeing a speedy winger too.