Problems with Jose Mourinho's reign here is a few things
1 he did not show a ruthless aggression is not only cutting the head off of Moyes and VG's legacy with some of the signings, but persisted with them to the point he wanted to prove them wrong, like a terrible siege mentality
2 signings in some area's not working out, or did not sign enough players with no plan B, and plan A on one or two signings was not exactly inspiring.
3 style of play and maybe coaching seems to really have been a problem
4 club's transfer record since summer 2009, poor planning after fergie left
You put this altogether, and players mentality still feels like a team of losers when things get tough, and we will keep having the same results until we see a ruthless streak in our managers etc