first its important to know that league management requires different skill, it needs someone that can keep players performing thru 38 games. and i don't know a nice guy that is consistently wining leagues. others always come short even if they produce a good team, just look at arsenal, over 15 years they played better football than MU, but won only 3 vs MU's 8 in that time.
Mourinho and Capello are managers like Fergi, they have zero tolerance when it comes to the team play, they respect the players but expect no less than 110%, if someone holds the team back he is dropped immediately, if he cant contribute to the team he will be even removed from training.
even Guardula at Barca is strict, but respectful, the first thing he did was remove players like Deco and Ronaldinho from the squad, and even parted ways with big money Ibrahimovic after one season, and dose not play signings like Afely if they cant contribute, unlike Kenny with Hendo.
sentiment from Kenny is why the season is becoming a train wreck.