Ramsey has been such a revelation this season, absolutely amazing the impact he has on the team. Everyone is raving about Ozil, and rightfully so of course, he's had a huge impact in Arsenal and has not needed any time to adapt, he deserves credit for that. However so far this season, Ramsey has been Arsenal's best and most influential player. He has been such a danger in the final third, whenever he receives the ball close to goal, it just always seems like he has something up his sleeve. Also credit to Wenger, the team has been playing some very good football, as a unit they play such a compact game, it reduces the spaces for the opposition team to operate in, and has so far masked Arsenal's mediocre defense. The only thing that keeps haunting Arsenal defensively is invidual mistakes ala Mertesacker today.
Giroud has developed his game a lot too, despite the fact that he's still wasteful, but he's become quite good at holding the ball up and bringing others into play, the midfield around him know that they can give him the ball and make runs behind the defense. The only other worry I have with Arsenal other than defensive mistakes, is the lack of depth in several key areas, which could potentially expose us over the course of a season.
I'm thoroughly enjoying what has so far been quite a surprising season by Arsenal though