Just like you, a very passionate Arsenal fan I know did tell me that he's taken his time to study the club's performance in the last three seasons and have come to conclusion that Arsenal's problem isn't about the players but the manager. The truth is Arsenal is currently better than how they were when Mikel Arteta was appointed as the club manager but the Spanish manager really needs to step up his game and improve the team from being a regular title pretenders to a title winners. I believe he has the managerial abilities to achieve that if he really works to achieve it
After this season I personally think Arteta out will begin to roll again in the stadium by many fans because they are currently tired and need some changes, there is no denying the fact that Arteta has actually turned Arsenal to a title contender over the last two seasons having fail to win both thanks to the brilliance of Pep Guardiola and the Manchester city players. So since Arsene winger Arsenal have actually been able to cement their place back into the top four of the Premier League again and are usually regarded as tittle contenders all under Arteta, so for some people he is doing great.
But realistically he is at a point now where he needs to actually start facing the questions of what are is achievement, he has won FA cup and community shield which I don’t think is highly regarded as the league and over his years he has spent more money. Arsenal weren’t used to buying of expensive players until after the departure of Arsene Wenger and yet with the 9 figures players he can’t still win some major trophies then he needs to be questioned. Some fans will tell you he needs time but personally I think Arteta has had enough to build even an army, he is almost five years at the club or more now that’s a enough time to actually win something. This season I was rooting for them to go all the way because of the way they have been closely behind Manchester City but yet like last two seasons they still bottled it, if Manchester United knock them out tomorrow then Arteta might be facing difficult questions about his future