I feel the Maguire's supporters on this forum support him mainly for 2 reasons:
#1 "He plays well in international tournaments" -
it can be easily refuted, many medicore players can play well in international tournaments. Rojo was in World Cup 2014 best XI, Joe Allen was in Euro 2016 best XI, tones of Greek players who were not premier league material were stars in Euro 2004. Poborsky shined in Euro 1996. The set-up of international games are very different from club football
#2 "He is great on stats like interceptions per game, tackles per game, etc"
These stats are misleading (perhaps has misled our scouts and scouts as well)
For example,
Virgil van Dijk (21/22): 0.4 tackles per game, 0.9 interceptions per game, 0.5 blocks per game
Matip (21/22): 1.3 tackles per game, 1.5 interceptions per game, 0.5 blocks per game
I don't think any person can dispute that Maguire is never a starter material for Man utd. Whichever team he plays in , be it Hull, Leicester or Man Utd, the team concedes tones, this is not a coincidence.
He got good headers, true. He is proactive, true.
But:
He easily got pulled out of position which disorganizes the defence
He is slow and clumsy. He fails to keep his centre of gravity low.
He has lapse of concentration too frequently (10+ big errors per seasons; while a good defender usually only make 1-2 big errors per season)
He is not calm enough as a defender, he just aimlessly head or clear the ball to opponents while he has the chance to chest it down and pass to his teammates
He loves to hoard the ball in his own half and fail to release the ball swiftly which gives time for his opponents to cut the passing lanes for Maguire's teammates. While he has decent passing skill as a CB, he loves to pass the ball too slowly and kill the tempo of attack
He shows no urgency when his team is behind. He has no ability to encourage, motivate or guide his teammates
He loves to foul whenever we got FK or corner kicks.
These made him a standard 80-rated-on-FIFA medicore CB.