In the case of Luis he certainly defends better than Marcelo but is miles away in offensive terms.
I blame Mourinho and of couse maybe Luis was more adapted to Spain, but I keep hearing that when players fail in England they are awfull, overrated and so on, but at international level they perform, that is why I say that maybe the problem is in the quality of football played today in the EPL.
One just needs to look to the quality (ok forget for a moment Victor Kasai) of play between Real and Bayern and then look to Leicester and Atletico, to be fair to Leicester, Atletico is the Leicester of Spain, they don't care if they have to play ugly.
What I mean is, putting aside the referees, does anyone really believe Chelsea or Spurs are on the same level as Real, Bayern, Juventus, Atletico or Barcelona?
If United wants to chalenge them it will not be on the amount of money spent, that is what England has been doing in the last years and does not translate inside the pitch, of course it is only my opinion.