JazzG I think he makes too many mistakes for a top keeper. He’s had some superb performances but apart from his first 6 or so months his form has been very patchy. Too many times giving away cheap goals. I’m glad Arteta has noticed this, for a top side simply hasn’t shown he is good enough imo.
Maybe this is the kick up the arse he needs.
To be honest, I think the most parsimonious explanation for his performance levels is that the overall variance in his performance is just what you ought to normally expect from a slightly above average starting PL keeper. He's still kinda young but it's worrying if we're really aiming for the very top.