IMO Juventus biggest fault was to appoint Del Neri in the first place, he is a mediocre coach and he's not gonna change that anytime soon.
He's not a rookie anymore, he's 60 years old. same age as Wenger, both Mourinho and Ancelotti are younger than him, let alone Guardiola. If by this point he hasn't achieved anything it's because he's not gonna do it (one wonder season with chievo and one with sampdoria are not really big achievements).
It's not complicated to come to the conclusion that when you appoint a mediocre coach you should expect a mediocre team. Yet people act surprised when you sell Diego and get Quagliarella, it was a predictable outcome.
He's just a mid table coach and nothing else.
Any and i really mean it, ANY half competent coach would've found a way to fit his best players into ONE system and not force HIS system down his players throats. Let alone sell them.
Go ahead, sue me for my opinion.