He hasn't even been "poor" in my eyes anyway, I just think people expected some kind of Messi performances that he's not really capable of yet.
He has been good in possession and we've rarely lost a midfield battle yet apart from against city (tactical issue)
He's carried the ball forward well but the lack of movement/link up from our forwards has left him a little lost, he's ended up resorting to having to hit pot shots which haven't been his best.
I feel that as a team we really lack balance and understanding, but once it all comes together we will see the best of him.
So far though I hardly think he's been poor, just fairly average. Hasn't pulled up any trees but he has improved us so far.
We definitely need to take him off the leash though, let him use his running and power positively without the worry of losing the ball. a 4/3/3 with more room in the 10 and forwards that keep the width is desperately required.