Pogba is a great player, he built half of France goals with his long passes when they won the World Cup.
But nobody's making runs behind in MU team, partly because Mourinho asks his wingers to track back a lot too much, partly because his teammates just mostly suck.
Pogba was on the bench today and they got destroyed by Liverpool. He's not the problem in this team.
His strongest quality is long passes from deep. He needs a team with fast attackers running behind the line. Which Mourinho MU isn't at all.
If Pogba was bad, he wouldn't have been one of the major contributors in a World Cup winner team. He was one of Juventus best players too. Look no further than Mourinho and his tactics if you want to know why everybody suddenly looks bad in his team.