Arteta is really doing an amazing job on Arsenal players, if it was Emery, Arsenal might have lost or draw against Everton, because his substitution is mostly awful, but look at the turn around Arteta is doing, Mustafi looking like a Prime Cafu, it's been a while I saw him play so good as he has done today, COYG!
Indeed there is some noticable positive change in Arsenal. However they still have to work on that lose defense. The forward line is more than Okay right now and the young lads are growing in confidence every other day that passes.
Let's also not forget how far Everton have improved. Dominic C Lewin and Richarlson just can't seem to stop scoring.