It certainly isn't Busquets fault on the recent goal where Umtiti tried to tackle, either.
I think he is mostly not at fault, has played well, and I hope he will keep playing well.
You obviously think otherwise, and alike some other posters here I get the feeling you even hope he will play badly.
Whatever we think, he will probably keep playing, and he has many weaknesses that cannot be changed, so the team should be setup in order to hide these weaknesses.
Playing with Puig+Pedri in front and De Jong+Pique behind, I can not imagine the result would be that anyone would criticize him.