Balotelli could have been one of the best strikers in the world right now if he wasn't...crazy.
It seems that he goes into cycles: stable, psychopath, stable, psychopath...
If he were to calm down, mature a bit (hopefully with his new born he's forced to grow up) and start concentrating on football he could be a wonderful player one day and I'd want Juve to sign him, but until then he's a bit of gamble I'd say.
Anyways I can't see him ever coming here so no use in talking about it.