If domination and better football won all games, City deserved to win, over 90 mins they were better for realistically 2/3rd's of the game at least, maybe more.
But ultimately City dominated much of the game till Tevez came on, without scoring or being a really big goal threat....
Utd played well only in parts, and if that is really the performance of the season, that is nothing more than an embarrassing statement of how bad Utd have been and how poor the league is becoming. Utd sucked for long portions of that game, and while it was end to end, Utd went up the pitch repeatedly without looking threatening, the 3 shots on target being pretty key, they didn't miss a huge number of other really good chances. They got to the final third pretty easily from 30 mins onwards, but they did incredibly little when they got there. City were the same till Tevez came on then really had enough of the ball to win but outside of Tevez they looked clueless in the final third.
Utd deserve to win, not based on being better over 90 minutes, they took the few chances they created, and while they played at times some woeful football, it didn't cost them(which is City's fault, not to Utd's credit).
Honestly that first 15 mins was amongst the worst 15 I've seen from any team this season, had Tevez been on in that first 15, the game could have been over for Utd.
Utd put the ball in the net 4 times, City didn't, ask Wenger about possession, domination and better football, the team that scores the most wins. City may have played better in general and for more of the game, but they weren't cheated out of a result, poor refereeing made incredibly little difference to the result, including a potential sending off for Tevez if I'm recalling correctly and his kick out was really very late in the game.
City need a manager better than Mancini, and someone with more energy/better fitness than Yaya long term, or someone faster and with more quality than Barry to free him up from defensive duties.
Utd also need a improved manager, Fergie is past it, a team that all year has started almost every game poorly.... but for Mancini letting Utd off, that first 15 was truly and completely pathetic. Two counter attacks, helped by poor defending and keeping(but still high quality counters anyway), was all they could really muster till the final whistle. Its not good enough and its being widely regarded as one of their best performances.
If Utd keep going backwards, they'll struggle in Europe and struggle to build a really top team with an ever increasing number of really average players in the squad.