Personally, I'm a big believer in both cultural authenticity and in not knowing what's going on. That's why I play games like Assassin's Creed, Metro 2033, and Indika in the native languages of their settings. Why should I listen to British or American voice actors affect accents when I could hear the game's script in proper Deutsch, Español, or Russkii?
Alas, I'll have no such option in the upcoming Mafia: The Old Country, the fourth game in the Mafia series and the second (or third, if...