He's a good player, he's proven it at Villa, but something clearly isn't right atm. Pretty unprofessional if he's either not physically or mentally prepared to play after a few weeks of the season.
The thing for us as fans is that for the money you expect a starting player and he's taking the slowest adjustment into the first team that I've ever seen, like he's some green kid.
That said, a Brazilian coming from England to Juve could always go two ways. He might have a mediocre first few months or even season then a great second year, but most things in football are looked at on a weekly basis now and there's no hiding. We're lucky there are other players who can fill in for him.