From a purely footballing perspective, this transfer is crazy. I doubt that one player can make enough difference to justify that price. However, it's not only about what's on the pitch. Pogba was Juventus's marquee player. He brought interest from people who wouldn't otherwise care about Italian football. He'll be one of the marquee players in Manchester, getting back some of the interest that was lost when Ferguson retired. Football isn't just about whats on the pitch anymore. He brings the flash, the highlights, the celebrity and the youth that few can.
Kante may be a better fit for us, and I'm glad for that, because I'm firmly a chelsea supporter, but Pogba has the ability to bring interest that very few other players can.