He is doing better than Fellaini does in midfield but its plugging a round hole with a square piece. The player ends up being a midfielder after a few years at this role and he will lose his voice up front.
Would United do better by having two key strikers upfront rather than one scoring the goals?
Remember when Alan Smith joined Manchester United and they tried to convert him to be a midfielder. He did ok but was 6 months later trying to convert back and it was too late. He lost his finishing ability and was lost in the shuffle.
What if Zlatan got injured? Where would United find the goals? Now one goal away boasting 250 for Manchester United, a record, Rooney will expect to improve in the weeks ahead.