My opinion on the match.
The defence was solid, especially with Blackett in the middle but really, the kid is becoming something else.
Young was dangerous with his pace and crossing while James looked decent although he was quiet and offered no threat.
Herrera was good in the midfield, especially with his crossfield passing but I would say he offerred no penetration through the middle and as such, Mata game suffered. I'm not decieved with the midfield dominating possession because it was as a result of Valencia's defensive tactic which allowed us to have more of the ball but the truth is we didn't control the game.
Rooney is better in a striker and should be be paired with forwards who offers much more than Hernandez because Rooney's deficiency becomes more apparent when he's asked to play the linking role (Robben's role for Holland). But as a striker with a player like Januzaj/Welbeck alongside him, he's good to go. I'm sure the same problem would arise when Rvp returns to the team and the question would be, who will be the striker?
The best thing for Kagawa is to leave, if he's going to be shoehorned around various position, imaging him playing as the striker! He's too good to be a utility man and if Van gaal won't define his role in the team, it would better for him to leave.
Lastly, eventhough Fellaini is a slow, clumsy and red card waiting to happen player, his best role still remains the box to box role and not an holding midfield role. He was fantastic tonight and should be aknowledged.