The movie about con-gangster Minkow, often mentions how charismatic he was and had to be to be succesful. But seeing him playing himself in the second half of the movie (a very strange effect imo), made me question this. He doesn´t come over as charismatic.. or anything special.
On the other hand he seems to have talked quite some known names from Hollywood to be in this flick.. so maybe it is true after all.. or he just paid them well (what i think is the reason for his "success" anyway.. greed.