I think you have to look at the defence and midfield he is playing behind, I am not sure that many keepers could do that much better in the circumstances and certainly I do accept that he has made some high profile blunders.
The Goalkeeper is exposed because of the defence and the midfield.
The defence is unsure because of the goalkeeper and the lack of midfield protection.
The midfield is under performing because of the defence and the forwards.
The forwards are struggling because of the midfield.
The whole squad is inconsistent because the manager keeps changing things.
The manager can't be blamed because it's not his squad of players.
Sounds like we're nearly there, just a few tweaks.