I think we suffered defensively almost exclusively because we had no fullbacks. Put Sagna and Gibbs/Santos in that team today, Vermalen and Koscielny in the middle and they wouldn't have created anything like the same number of chances, in my opinion.
The midfield did okay. Nothing special, but they held their own and passed the ball well enough and were okay without the ball. It was the front three that really lacked quality today. Walcott, Gervinho and van Persie, as an attacking unit, just don't have the same quality as Silva, Balotelli and Aguero - and that was what decided the game.
Everywhere else through the two teams is pretty much evenly matched, but they trump us by a fair distance in attack.