I honestly just cannot see it with Maguire at all. OK, he is slightly above average at winning balls in the air (when played straight up the pitch, he seems to be caught out frequently by set pieces and crosses) and at times he can play a good pass out from the back (though I don't think this is a regular and I can remember just as many if not more standout moments from Lindelof and Varane in this regard).
However, his weaknesses are just so glaringly bad I can't understand how they can be overlooked. I have never seen such a so called "top, top" defender get completely done on such a regular basis. This isn't even when coming up against the best at their peak (see Torres giving Vidic the runaround at times) it can be any run of the mill player from any run of the mill Premier league team. All it takes is an attacker with a bit of speed and nimbleness and he can be made a fool of. Time and time again he is just skinned alive by players. Even last season when he was supposedly "rock solid" it still happened on a regular basis.
There have been plenty of top class centre backs that haven't exactly been blessed with speed and yet they weren't exposed so horribly and so frequently, they made up for it with positioning and reading the game. Maguire just doesn't have that and he's as big a part of our defence being a total mess as anyone else. As a captain he really is just pathetic, I think there was one video of him cursing at Shaw once and it was blown up as evidence of his leadership. I prefer to look at the longer term and see him just being another body out there, following whatever way the mood is going and not being the one to stand up and lead by example and try get players going.
What the criteria was for choosing him as captain I do not know (transfer value? height and BMI? Forehead size? Nationality?) but whatever it was it needs undone straightaway. The captain should be a role model and the one others look up to, not the personification of the abject failure of the team.