Pretty simple Matt, when not facing shots your unlikely to concede goals. If he faces shots where he needs to make better than average saves....and he makes them, then I might change my opinion of him.
You think he has been making great saves while I think he has faced shots that a premier keeper should save. I don't want an average premier keeper, I want a top end keeper to take us another step.
Take the city match.
He has received a lot of credit for his performance and rightly so, even from me. But did city have any efforts that you wouldn't have expected 70% of premiership keepers to save?
That's the way I look at him. A decent enough stop gap, but a stop gap all the same!