I'd disagree with that American, and I'm not talking specifically about our game against Chelsea.
I have seen plenty of matches where the better team has lost, and really the better team. Just because their opposition have outscored them, perhaps getting a couple of goals on the break with their only chances of the game, in a game in which they have barely featured, does not make them the better team on the night. There can always be the argument that they deserved the victory, because they took their chances and were not wasteful, however, I don't believe you can say they were the better team.
As I said, I'm not saying this is at all how it was in our match against Chelsea, but to think that the better team is decided purely by who scores more goals, is, in my opinion at least, not always right.