He was pretty efficient before but that was when we had some concept of a midfield/understanding of how it worked. He really was a revelation in breaking up play, being the enforcer and letting his team mates get into the game around him.
Now, I feel like he's in a role where it's over his head. The whole tactics Wenger is playing right now is just wrong on so many levels with the players we have anyway. Hard to just define one players' position when the next one has a huge flaw too.