#3 Romelu Lukaku should not be anywhere near set-pieces United defend
For a man the size of Gibraltar, Romelu Lukaku is unusually suspect at set-pieces he's defending. He was at fault for the two goals City scored in that vital derby, he almost gifted Arsenal a way back during that important win at the Emirates and his tentative prodding at the ball led to the ball bouncing to Ashley Barnes.
This is not to say Lukaku is not a wonderful player. He is, his movement off the ball at times is magnificent while his passing is a vastly underrated part of his game... and while he does not get enough chances he shouldn't be judged too harshly on not scoring on sporadic occasions.
But none of this means that he should escape criticism for his ridiculous defending of set-pieces. Lad's fast, Jose... keep him on the halfway line and let your defenders and midfielders sort out the balls into the box.