Squad wise for Arsenal, I'd say that they have thse players who are CL team quality:
Auba, Lacazette, Leno and Bellerin, maybe Torreira, but I'm really not sure on him, he started well there but hasn't really been able to cement a place.
Then they have a group of players like Guendouzi, Martinelli, Saka, Saliba and Tierny who are young and talented and could well become the 'real deal'. I guess maybe Pepe can go in that group too. Not that he's as young as some of those.
Then they have a glut of average to poor squad players, too many that are regular starters for them, like Kolasinac, Mustafi and then players who are the wrong side of 30, such as Sokratis and Luiz. Then there's Özil and that mad contract, and Xhaka who is persona non grata.
I mean, there's defo talent there with the young players and those in the first list, but much to do! They are a bit of a mess of a squad.