Marotta handles the financial situation. The financial situation is based off of how he buys and sells players, manages investments, and most importantly, how the team performs on the pitch in order to generate revenue. Revenue arrives from sponsorship deals, attendances, and various success in the football market. What is the main driving factor that makes a team successful? Well duh, success at home and abroad. Who creates the success? Well, a general manager who buys the right players, along with the coach who decides and trains the team with the players acting as the frontline of the organization.
Marotta has purchased players who have had success, others who have not. But the main burden of success lies upon the coach and the players who produce the product on the pitch. The GM can only act as a catalyst to generate success; without proper management and staff below, the organization won't be successful. This is a very important rule of managerial analysis. You're only as good as the staff that produces and markets your product.
So that's why I think very lowly of Marotta, someone who has had obvious failures in the transfer market, including the inability to sell players for decent sums and pull off risk/reward transfers that Moggi handled. Marotta signs the players that do not take effort to entice, those that already play for the Azzurri and in Italy. Of course they want to sign for the best team in Italy. The others from abroad wanted to join Juve as well, whether it be Vidal, Llorente, or Barzagli. They are not difficult transfers, they are transfers that any large club could pull off.
Therefore, in my view, the praise rests solely on Conte who changed the dynamics of the side and revitalized the club. He was the manager who brought out the best in the players, including Barzagli (who was always a sporadic defender beforehand), and instilled the passion to succeed again as an organization.
Essentially, it doesn't matter who Marotta purchased -- Conte would have succeeded to some degree with whatever base of players that he had at his disposal. Why? Because Conte is an intelligent player, coach, and individual. The proof is in the pudding with the way he handled the lack of a decent striker this term. What a bunch of mongoloid one trick ponies.
I will give credit to Marrota for Pogba, however. That is the single signing that actually took skill and acumen. So credit to him there.