I think both are big problems. Since Ferguson left, we signed two type of players: either a overpriced star that we didn't have a clue how to play, but signed anyway to show how big of a player we still are in the market (Mata, Di Maria, Pogba), or players that can do a job, but can't be the foundation of a team (Blind, Darmian, Herrera, Fellaini, Rojo, Schneiderlin). So we ended up with a squad full of holes ( FB, CB, CM).
In another hand, we have no ideia of what to do with a football, and that's up to Mourinho, although it's worth to notice that we didn't have a clue with Moyes and LVG too.