Tough to compare defender performance in Serie A and the EPL. Just because Darmian hasn't been stellar at United, doesn't mean he won't be good with us. EPL systems are much less structured, with team defending being emphasized a lot less. Good 1v1 defenders excel in the EPL, while Serie A defenders need different attributes, such as concentration. Truth is that in Serie A, the backline is hardly ever exposed, while in the EPL those situations develop several times per game. As Modric said: "Juventus defenders are very good when in position but struggle in counter attacks". When defenders are drilled how to defend as a team and then flung into an open system where you're facing multiple 1v1s per game, that player will naturally not appear as solid.
