Way too many have a problem with this. He would be a very dependable back up. He's wouldnt be signed to be first choice.
United have the face and others, Chelsea have cahill and dont start on Liverpools. None of these are "quality" players.
Squad depth is our main concern going into the business end of the season. It is what may cost us a trophy with key injuries at the wrong time.
At CB (possibly the most important position in the way we play where everything starts and the speed is injected) currently we have no dependable back up (mangler and vinny shouldnt/cant play).
Who he played for in the past shouldnt matter. In January it is who is available. If signing Evans means we can give Stones or Otamendi a rest the weekend before a big game without panicing over a kompany injury or a mangala mistake then it makes complete sense.