I don't think Rooney was as bad as people say, not worse than any other player out there..? But playing Rooney on the right side like in the 2nd is the only right thing to do IMO, in the "Mata" role. He can hold the ball well, pass it long/short and cross well, let Valencia overlap and does the defensive work better than Mata and that will also open the CAM spot for Mata and Mkhitaryan instead!