The manner of the defeat is the problem for me.
No creativity really. Ronaldo continues to be a passenger he contributes nothing, can't create something for himself, he's dead weight.
The first goal was sloppy, the free kick will rarely go in but it did, United were 2 behind.
The fact United can't score more than one goal is the real issue here. Nothing in the middle of the park, United need a De Jong that can carry a ball. Get Tielemans on a free, get someone Erikson this isn't his kind of game united need a ball carrier.
Then the wings, United can't rely on Garnacho and Elanga, Rashford rarely crosses, it's all sluggish nobody gets to the by line and crosses, United do miss Antony and Sancho right now.
United need a striker and a ball carrier, of course a GK would be nice too, Shaws crosses are always flat, many areas of improvement.
United got comfortably beaten by Villa even if you take away the two goals as said above, United were never winning this game, shocker.