I am a Sicilian and I also happen to know quite well all the characters represented, apart from Schiro' which is the only fictional one. I am amazed at the way Sicily and the Sicilians are portrayed: so accurate. The dialogues, the accents, the tics, the looks in their eyes are incredibly real. A lot of the actors are not Sicilians yet they manage to capture the essence of the culture of the island. Never during the series does anyone speaks in a less than perfect Sicilian (with a Palermo accent even). The Sicilian dialogues in the Godfather are ridiculous... But apart from this, the series manages to show how it is possible that someone after all so ignorant like Riina becomes so powerful, because he's very smart and clever, and uses his own code of communication in which he's very articulate. The mixture between reality and fiction never comes to the detriment of one or the other, it's a perfectly fine balance. I appreciate that Sicily is not abused in the photography, the background is never too idyllic or too crude. A real masterpiece!