That's why they're still regarded as the most important criminal organization imho; even in this day and age the mob is still the most resourceful, they still have their fingers in all the pies and their reach is still the furthest. If you're a serious criminal wanting to make a buck it's still much more profitable working with the mob and going against them will get you nowhere at the end of the day.

I don't think the American mafia is being mocked by other criminal organizations; they're definitely respected, but the way I see it, it's not out of fear or the threat of violence.

Italy of course, is a different ballgame. If a locally active Nigerian, Albanian or Chinese criminal would lay his hands on for instance a high ranking Camorra or Ndrangheta member he would see his sweatshop getting torched and his family being killed and dissolved in a barrel of acid in no time.