Putting aside Arteta and his histrionics and the "over celebrations", at the end of 2 matches only Brighton (am I right ?) have 6 points along with City and Arsenal. I well remember the recent seasons (many of them) when the pressure of winning every game was on us right there from the start of the season, literally the first game. So from that point of view I understand how big the 3 points were for Arsenal, as NB said, you assume ADFC will win every game. (But I bet they won't).
Secondly the reason Arsenal came very close to winning the League last season was the start they had. They won game after game and were well out in front at the World Cup (midpoint). So in some ways you can see, if you are serious about winning the league, how a similarly blitzed opening half of the season sets them right up for it. So, again, this is why Palace away, with 10 men, a win, is so important.
At the stage, I don't City will "hit 100" or anything like it this season. (Age, Lack of Hunger, injuries, boredom ??). If I was Arteta and Arsenal I would stress to the players that they can finish better this season and that they are capable of running away from the rest right from the "off". They did it last season. At least that's what I'd be saying !!
Let's see.