With the heave amounts Manchester United has spent for this season, I still think they have a huge hurdle in their squad - inexperience.
Having Ole as their coach as a freshman in his stint, it is an obvious problem. Second? Its obvious, their front attacks are fresh and not mature enough to handle big games. They might but the inconsistency isn't their.
Rashdord, Martial, and Lingard are all struggling in maintaining their momentum. They have a lot of bad games. This is what matters the most - the experience.
They sold Alexis, Lukaku, Mata, Jones and many more players who can add the experience quality of the squad. They may be aging but they are a factor in guiding the youth.