Apparently the match already took place and the gunner's suffered yet another loss in the season to local rival Chelsea Football Club. Prior to the match I didn't really see come up with anything has their first league game against Brentford revealed all their insufficiencies and showed not really changed from last season their numbers or signings.
I don't why you expected a positive result, I guess because you are an Arsenal fan. The thing is you don't have to be blind to somethings. I often wonder why some choose to stick to a club like arsenal. I don't seem to get the logic has supporting the club isn't good for state of one's mental health considering their inconsistencies and certain things that come with following their games.
Since Arsene Wenger left, Arsenal became worse with the new managers. I wouldn't want to lay the blames on the managers or coach but rather on the team management policy of transfer signings. The club seem to the for average signings despite the fact that they are in the top ten of the richest and have the money to really compete with other elite clubs. Has it stands now, Arteta may be the one to manage the club, I believe time should be given to him before the club decide to handle their root cause going forward