I'm going to agree that overall, the polarity of the opinions here on Pogba is quite amusing.
However, he's not really a box-to-box that performs ALL aspects of midfield at a GOOD level. Defensively Pogba is very suspect. Whenever the opposing team launches an attack, Pogba only has a knee jerk reaction to run back. He doesn't intercept, he doesn't know where to position, he fails to win balls in the air, he doesn't tackle etc.
Pogba himself admits that he's "more of an attacking player", and although I'm not sure whether he knows how bad he is defensively, the purchase of a specialist defensive midfielder in Matic says it all.