So yeah see the same similarities here as well. United fans calling Maguire shit (He is definitely not worth the price tag) but hes a great defender for England and was for leicester. How he turned to shit after coming to united is majority on ole.
Maguire has some very strong defensive qualities especially in the air. His major weakness is speed. Leicester and I believe also England play with a strong defensive block but are very quick and effective in the transition phase. This works well for a defender like Maguire who has little running to do and can instead impose himself in the box with his strength and height.
The problem emerges when he is expected to push up the line to help break the opponent's defence. If the opposition in turn effectively counter attacks, Maguire does not have the pace to catch up. Again he is not a bad defender, but he also is not a world class defender in the ranks of say Van Dijk.