Have to say I wasn't particularly impressed by his PSG. The one plus side to Arteta being an unknown quantity of sorts is that he could, in theory, turn out to be great and rival the likes of Pep and Klopp just as much as he could turn out to be useless. The problem with guys like Emery is that it's hard to imagine them being any better than decent. I'd rather gamble frankly.
There's been talk about safe options etc, I think he's the ultimate safe, middle of the road option.