Pogba is an interesting player, he can be a real gem or he can fail horribly.
It would all be up to his attitude, the pressure on him by the transfer fee and the way he fits the plans of the manager.
If Lucho wants him, than fine by me.
But to me, if he comes here because the board wanted a "mega signing" than no. The price tag he has sholdn't in any way exceed the fee of James Rodriguez. He's not a shirt seller - we have Messi, Neymar, Suarez for the shirt sales.
I say we have good young players who deserve a chance to prove themselves and just for the sake of competition should we add another midfielder like Kovacic or Gündogan. But the midfield is not our main concern atm.