Pogba is an absolutely sensational footballer. He can basically do a bit of everything. He's more of an attacking midfieler than a defensive midfielder, which for some reason most seem to believe to be the other way round.
Renegade's post was spot on earlier. His success will depend how he's used. Sit him in a double pivot like Deschamps did and he'll look no bettter than your average midfielder.
Get him up the pitch, central, right, left, runs in the box and he'll be phenominal. And at 23, in 4-5 years as inflation rises, he'll look like a bargain.
He will almost certainly be played as part of a midfield two from the start and I don't think he will look average at all. He should be deployed as part of a midfield three or possibly even as a ten but with Rooney stinking up the place he won't get a chance to do that just yet. I'm sure he'll be given the freedom to drive forward from midfield.