Balotelli is a retard but his worth for Milan was greater than it ever will be at Liverpool, he scored 26 in 43 for them. Torres hasn't had a ratio like that since his penultimate season at Liverpool.
Having said that I'd be somewhat surprised if even Torres can't get 10-12 goals a season in Serie A, he's playing for a team who create a lot and a league where good defenders are hard to come by.