From what I saw, he wasn't particularly great even at Catania, so I have no clue what to expect of him.
Regarding fullbacks, Abate is great. But yeah, one isn't enough.
I wouldn't say that. Our attacking line up is pretty much world class (barring injuries). In defense we are also covered quiet well, except for the LB position.
In midfield - Nocerino and Boateng are potentially world class midfielders, but we severely lack box to box CM like De Rossi, Schweinsteiger, etc.