Isn't it normal to have an opinion on non-Juve players ?
Personally, i'm a big fan of Amauri and i'm all for his transfer to Juve, but if someone saw Amauri play and he doesn't want him in Juve or thinks he is a bad transfer, then he/she probably has a reason to think so.
What i find funny are people who didn't see Amauri more than once and they write how he's not a good transfer, because he's old and we need younger players or simply because he's not as hyped as some other attackers.