All this nonsense talk about stats and none are produced. Who needs stats to see how good a team are or can be, just watch them play!
Having said that, I don't believe Arsenal are there as the best team in Europe. Kuz, those two fatigued matches don't mean anything? Don't make me laugh. They cost you the world's oldest tournament and the world's most prestigious tournament. Losing the Champions' League will mean something to Arsenal (if not to you), it's the tournament Arsenal care most about. And if you're going to lose your place in the CL through one sloppy 45 minutes, you're not going to be the best team in Europe now are you. The best teams keep their focus, they keep up the energy for the crucial games (and parts of).
EDIT: For the present time I will concede that I believe Arsenal are the best team in the country. But moves need to be made in the continent.