If you're referring to my post, I don't think luiz is bad. Nor his positioning (although it is not his greatest attribute to say the least. It's his wild runs that leave gaps, I don't want to see a central defender run into the box while dribbling past 5 men and I frankly don't care if he makes passes that would make iniesta jealous. Take a look around, the best defenders are no-nonsense players who do their job properly. Kompany, Terry, Vidic, Puyol, Pique, etc.