His lack of ball playing ability and offensive skills put me off. Opposing teams also know about this weakness and target him. In every build up from the back opposing teams close off our left side and leave space on the right so the pass from the CB will go to Wan then they'll pressure him and he's most likely to lose possession.
I think his touch and technique are generally good. His final ball as an attacking is definitely poor.
However, I think the bolded parts is a bit unfair to pin on him. Part of that problem is due to him receiving the ball from Lindelof, who despite being hailed as a ball playing defender plays awkward balls to feet and doesn't take command of situations fast enough. For example when pressed, he's far more likely to go back to De Gea, go long or fire a ball to AWB down the channels. I find he's on his back feet quite a bit and doesn't release the ball fast enough or lacks confidence carrying it when pressed. A good example, was when he got mugged by Sterling today; that was a situation that should have been dealt with way easier than his fudged one-two.
Generally I've been impressed with AWB's ability to recycle possession in tight spaces and I like his efforts i.e he's not a Young and hoof it down the line type but we're not properly creating the right angles and spaces for it. Sometimes it's forced and that puts him in uncomprising situations, which you can also put down to inexperience (due to overplaying). To help, McTominay/James and the '10' all have to drop back much faster to give Lindelof/AWB the space to play it out from the back. Conversely, the left side is slightly stronger because Fred, Rashford and Martial (better ball players) all naturally drift to that flank.
In the grander scheme of things though, these details need to be worked on i.e coached on the training field.