No, sorry, but this just isn't true in the slightest. I don't agree with 90% of this.
The issue is you've not applied context and the cold hard reality of how those players have
actually performed on the pitch, as opposed to them simply being big names. You've also not factored in the injury issues they've suffered, which have clearly affected us too.
Partey is a good player. But injuries and being in and out the team have meant he hasn't fulfilled his potential with us so far. He's not been that great for us.
Odegaard has only been with us for 2 months. He's done well overall, but our horrific form was in 2020, not this year, and that's the main reason why we're in this position. He joined when most of the damage was already done.
Guendouzi is bang average. I've not seen anything from him that makes me think he'll make it as a top midfielder. He's gone to Hertha Berlin and has done OK, from what I've read, but has hardly been a monster in the middle of the park. He's always been overrated by Arsenal fans.
Ceballos and Xhaka are absolutely NOT at the required level, especially the former. He's had countless chances and simply isn't quick enough or mobile enough to succeed.
Maitland-Niles has predominately played as a right-back for us.
He's gone to West Brom to play in central midfield and not exactly pulled any trees there.
Their own bloody fans have said so:
http://westbrom.com/forum/index.php?topic=25565.150
Mari has had 15 first-team games for us. If you think that's enough of a sample size to say he's a top player, that's up to you, but you're not correct if that's what you think.
Gabriel is still young and learning. He's had some excellent performances for us, but he's also suffered moments of inconsistency.
Mavropanos has played 16 games for Stuttgart this season. He's been having a good loan spell when he's played, but has suffered injuries over there, too. This has no relevance to Arsenal right now though. Likewise with Saliba.
Tierney is a top player, but he has been injury plagued and that has affected us this season.
I do agree that there's been questionable decisions made - but you vastly overrate the quality of some of our players, and haven't contextualised the situation each player has gone through, which partially (but not totally) explains why we're mid table.