The bottom line about this guy is that he has shown nothing to warrant his price tag to date.
Momo is a much better player than him atm.
And as for Momo not being able to attack, his attacking support and shot set up Marchisio's goal
I disagree and plus you are mixing non-related stuff together.
First of all, Momo is completely different player from Melo. Melo get the ball, tries to combine with other midfielders and open up space, to make it easy for you, it's organizing the middle. Momo on the other hand is for covering more than Melo, defending and using him mostly because of his stamina and defensive skills. I hate comparisons between Juve players btw.
As for Amauri hasn't shown nothing, this is also wrong, he started very well, then faced some difficulties and made silly mistakes in some matches but overall he's a great player that we haven't seen much of him because he needs to settle and people like you should be a bit patient on him because we can benefit a lot from him.