Arsenal's biggest problem is Arteta himself, he is mentally fragile and prone to hysteria when things are not right for him.
His club have an absolutely abysmal disciplinary record, which means he either hasn't got the control over them that he should have or that it's part of some weird tactical battle he has going on in his head. Either way it shows a weakness that a professional football manager should not have. Under his leadership Arsenal have adapted the Dipper perspective of always being the victims and refusing to accept responsibility for their own errors.
And despite the amount of money they have spent they still fall back on the dark arts in order to get through 90-odd minutes of football.
Somewhere beneath that strange, cube-like bonce of his there is a decent, personable man who perhaps would have done well to cut his teeth in the lower leagues before taking the hot seat of a Prem club. But I really do feel at this moment in time that he is doomed to failure because of this odd, pessimistic streak that he has, and that he seems to have passed on to his players.