I could live with Ozil's lack of defending if he made up for it with his attacking play. He doesn't.
It's not all on Ozil though. We need that same sort of effort and discipline from Ramsey and Xhaka for every game. If Iwobi keeps starting games, he has to defend and track back like we saw yesterday. Last season we wouldn't even bother to track back and a serious weak link down the left. Hopefully, he's learned his lesson.