5. Mesut Özil
Yes, I concede Ozil has been a great signing for the Gunners since arriving in the summer.
However he's been nowhere as effective as many pundits and journalists make him out to be. He's been largely absent in the crunch games where Arsenal have needed him most, notably games against the two Manchester clubs.
The German's defensive ethic is almost as bad as Santi Cazorla's and once again, without questioning his talent, he's easily marked out of games.