I personally blame Jose for Lukaku's failure. I think he expected Lukaku to be a player in the mold of the kind of Drogba or Costa or Milito, hard front men, technically sound who frequently make a defender's life hell for 90 minutes. But Lukaku isn't like that, despite his size he isn't the striker in the mold of above mentioned. He has a good left foot and likes classic wingers putting in crosses for him to get at the end of, he isn't a warhorse like Drogba or a constant niggling threat like Milito or Costa. United plays with inverted wingers and expects Lukaku to link up play. He has one of the worst first touches for a striker, and vision is average at best. If United reverts to wing play with classic wingers running down the flanks and putting in crosses, Lukaku will be a huge threat. At Everton he had Coleman, Baines and Deulofeu who used to put in wicked crosses in the box. But we don't have such personnel in the team. Either Jose changes his tactics or start playing Sanchez or Martial as the CF to get more productivity up front.