I think you guys are too harsh on Marrone. He does need to make himself more available, which he's just not concentrated enough to do at the moment, but he's hardly made any mistakes, kept the game going whenever he got the ball. Also players dont seem to seek him as they do Pirlo, which is normal.
You can't quite expect him to make us forget Pirlo and the rest are quite bad as well. There is no way he should stand out when there's players like Matri or Giovinco on the pitch.