My family on my mom's side is all Italian. Not only that, but a lot of them were from New Jersey. The way they talk and act on the show reminds me a lot of that side of my family. I don't think they were in the mob, though. The way they lived, I'd say... probably not.
The only Italian I ever heard growing up came in the form of food names and other random exclamations. Hearing all the same phrases on the Sopranos brings back memories, even though I don't know what they mean exactly. But if Chris Motisanti and Tony Soprano are using the same phrases, they can't be all bad, right?