I don't think he's a bad coach, i just think juve is too big for him, the fact is we have a team that is very very bored and disinterested in Italian competition and that has won more than sarri could win in 10 lifetimes, so how could he possibly motivate them.
If indeed he was a patatici hire, it would make sense, he looks to be a scouts hire, meaning he was looked at from afar and his stats were analyzed, but i don't think there was any diligence paid to the personal side of things or how well he would do at this stage.
I still think we can win despite of him though, we just need that moment, that slap in the face, maybe a red card or a convincing cl win.