I keep reading on the forums about luck being involved in this but I'm not sure how. We got a brilliant performance from De Gea - he actually caught up on about 1 1/2 years of not having to do much - but that was not 'luck,' nor was it luck that Arsenal have a poorly-drilled defence. Koscielny and Mustafi made a couple of foolish plays in the back and our attack punished them, simple as that. Our counterattack, when we did go forward, was absolutely brutal in this game.
Yes, Arsenal plastered us going forward but it couldn't really be any other way. They were more than up for it, a home game against a major rival, their attacking players were mostly firing, so it should come as no surprise that they would put up those kinds of stats. I've said for a while now that Arsenal would probably have won a title over the last few seasons if Wenger ever bothered to get his defence sorted out. I'm going to get flak from people but I think their attack is the 2nd best in PL behind City's (we're 3rd or thereabouts) or maybe even the best on their day.
You might remember our last win at the Emirates when Arsenal were pounding our defence all game...only to lose on the counterattack through sloppy defending. That was the Gibbs own goal when he plowed into Szczesny and Rooney paired up with Di Maria to score a second. On paper, we shouldn't have won that, either.
Mourinho should have dedicated the game to Paul Merson. Would've like to have seen his face after that.