One thing that is weird to me. The amount of posters claiming Maguire's limitations are all his teammates/ managers fault, meanwhile wanting De Gea out because he has limitations.
They are both very limited at what they do and not suited for a progressive system in the long run.
Thing is, Maguire has shown plenty of times throughout his career that he is (or can be) a very good defender. Not the world class, VVD sort of bracket, but still very good.
De Gea has never really shown himself to be anything but a world class shot stopper. Fair play to him - he has saved us many times over the years, but for me thats part of the issue in itself. If you are constantly requiring the GK to bail you out by making great saves, it means you are conceding too many chances and not playing well enough as a team. Some of this, DDG brings upon himself by not coming out or claiming high balls/commanding his area well enough - its like the old Terry vs Rio debate, one of them made brilliant last ditch tackles (read: saves), the other didnt need to because they snuffed out the danger in advance. Right now we have a John Terry in goal who is constantly required to make great saves.
Going back to Maguire since this is his thread not DDGs, I think Maguire is more than capable of playing in a top quality side, progressive side. If you put him in Man City I think he would look good, because (when his confidence isnt shot) he is good on the ball, good in the air, and good at snuffing out danger; put a sweeper keeper behind him so he doesnt get caught out for lack of pace so much, and you have a good starting point. Maguire's worst time at the club (namely this season) has coincided with the team being at its most dysfunctional; he performs better in a progressive, confident team. You could make this argument for almost any player, but I think it is more pronounced with Maguire and the other defenders because their job is naturally more reactionary, and in order to play progressively they need the players in front of them to be doing something.
That said, I dont think he should be captain, not the right personality for it.