United lost for one simple reason IMO - playing Giggs in mid-field. SAF went back to the failed early season tactic of playing any two of the trio of Carrick/Scholes/Giggs in the center of the park.
This is why United need to buy another dominant mid-fielder to partner Carrick next season.
Overall too looking at this defeat & United's lost to Chelsea in the FA Cup, i do feel that Mancini's suggestion the other day that United "dont deserve to be 18 points ahead" has some merit.
United regular Carrick/Cleverley mid-field duo really on paper isn't stronger or in some cases even with that of Chelsea's - Mikel/Lampard/Oscar, Man City Toure/Barry/Milner,Spurs - Dembele/Sandro or Parker, Liverpool's - Lucas/Gerrard/Henderson, Arsenal's - Wilshire/Mikel/Cazorla, Everton - Osman/Gibson/Fellani.
It just seem United have a stronger mentality to win which has been instilled in them by Ferguson of course.