It's an utterly failed tactic, mate - it's self-indulgent of Rooney and, besides, Valencia's lost the attacking verve that once made him dangerous; so it's a waste of time. I've no idea of an alternative.
Self indulgent?
That a player with usually 8 opposition players and a handful of teammates in front of him, in a compressed and tight space, with little movement(a whole other problem) decides to play it to one player in space and potentially in behind the opposition
Also ironic that united fans, I'm sure some of this Rooney diagonal pass hate group, bemoan our slow and static sideways passing will as quickly chastise a player trying a more difficult pass in behind the opposition or into an area of space.
So come off it, not only is it not self indulgent, it's braver than most. Fair enough Rooney might think it's a good looking pass or one he is confident of playing but really only he and Blind are confident enough and quality enough to attempt and succeed, with at least some regularity, these kinds of passes.
All this totally misses the point, he does it a handful of times each game and it's usually always on but he also regularly turned on the ball, drove with it and played it forward a good deal yesterday, provided through balls, kept it ticking over and was always offering himself, less so as the game went on and he dropped deeper but I think that was more a tiredness/comfortableness than anything else.
What else do you really expect or want, and do you hold everyone else to the same standards? I think not.
I thought he was good, probably one of the better performers, but not great yesterday... Certainly though anyone trying to criticise is blatantly looking for faults hyper critically and not being objective.