I think he's overrated as a CB on here but underrated as LB.
He was decent enough for us at CB, when he played really well, he was top class as he could bring the ball out the back and start attacks but he was also targeted by the opposition, they would try to drag him over to the flanks and get him 1 v 1 against a fast striker and it worked well at times, leading to chances and goals. He was also caught out positionally too often, stepping out of the defensive line and leaving a big gap behind him which exposed us. For me, he's a decent enough CB and can be used there sparingly but I wouldn't want him being 1st-3rd choice at a team like United. People are clamoring for a ball playing centre half, it seems to be the hipster thing, so naturally he gets a lot of mentions here to play CB and how good he was there at the time, forgetting about his mistakes and focusing on his ball distribution.
At LB, he's a solid option. He's suspect against pace but he has dealt with fast wingers quite well in the past. His passing is very good, and he can link up quite well with the LM. He's a much better option than Darmian or Rojo at LB, and would be a very good back-up if we could secure a first choice LB or Shaw fulfills his potential