He is the sort of player we have been filling the midfield with for the past few seasons
Decent, but glaringly lacking in a key quality for his position. From Ramsey, to Wilshere, to Cazorla, to Coquelin.
I'm not looking for one player who can do it all, but if you are going to get a specialist, go for a world class specialist. Then make up for imbalances with coaching and tactical instructions.
Xhaka has a good eye for a pass, but only when there is a lot of space and time. Maybe he gets better with time as he adapts to the pace of the league, but he still can't tackle, and lacks recovery pace without the impeccable positioning needed to compensate. Can't help that.
Edit: but I digress, this is the Ozil/Sanchez thread. Just do whatever is needed to lock them both down, then hope Wenger walks away soon and we can get a coach who allows us get the most out of them consistently.