So let's put things into context in the Hull game.
Pogba and Fellani were 'controlling' the midfield (bar the counter attacks), which of course were down to player ability but imo was mostly because Hull let us.
So there wasn't much support needed from Rooney in the defensive sense.
The runners/attackers in the game came from a poor Martial and Mata, who both to fair were not 'bad' on the ball but off the ball movement and penetration was non-existent.
The width came from effective but one-dimensional plays from the full backs i.e overlaps and crosses. Then there's Zlatan, our target man, who was wasteful at times with the ball and his touch was off but do consider he was in and around a very crowded box and didn't really get any service (of easy chances).
Looking at that Rooney individual performance highlights, obviously that video has been edited with only the good/decent things he's done because I remember the game quite differently.
So that establishes the context of the game, the responsibilities of players and how each other's performances affected each other.
Martial, Mata, Zlatan and to an extent (from an attacking sense) Pogba were below average.
Rooney? The same as above so he was below average (that assist doesn't cover it up) imo. However, you need to realise Rooney was basically our 3rd midfielder (with little defensive responsibility) and occupied most of the creative space and opportunity.
Every ball that goes to his feet means he needs to be interchanging with players to create triangles and pull the opposition out of play. Or he should be picking up the ball and creating penetration with his touch, dribbling ability or incisive passes/goals. Of course every no 10 plays differently and can be effective in his own little way and in different team systems.
Up until that assist what was Rooney's contribution? One good run in behind, one scuffed shot from the penalty box and a good cross. Otherwise it was pedestrian passes to feet and very ordinary movement in the third half of the pitch.
Look around every top on the this league alone, is that acceptable for you? Erikksen, Payet, Ozil, Sanchez, Mane, Countinho, Silva, De Bruyne, Oscar, Tadic, Barkley just from this league. Those players play in different systems and of course have their fair share of bad games but their form/touch and ability doesn't flucuate as wildy and poorly as our captain; they also regularly create chances and provide movement for their team mates to move into.
That's why Rooney gets criticism. It's a sustained level of below average/average performances in positions that are absolutely vital to the whole attacking style of play for Utd.
Martial, Mata and Zlatan should 'fear' for their places as we have players in the squad to replace them/switch it up. But you damn sure know Rooney doesn't need to fear for his place despite what he does. That's the criticism.