The acting is pretty ify at times. But it's just barely good enough to endure and follow along the story.
For some ridiculous reason, they bring in actors from fictional mob movies, to talk about the history of the mob as if they are experts or have real experience. It's so hard to take the show seriously when I see them talking with a tone of authority. However, there are historians and actual people that were in the mob, or related, that speak from time to time.
Also, if you have spent any amount of time studying the history of the mob, you'll notice many inaccuracies. So it's best to take it all with a grain of salt, not take it too seriously, and view the show mostly as fiction that's inspired by real events.
For some ridiculous reason, they bring in actors from fictional mob movies, to talk about the history of the mob as if they are experts or have real experience. It's so hard to take the show seriously when I see them talking with a tone of authority. However, there are historians and actual people that were in the mob, or related, that speak from time to time.
Also, if you have spent any amount of time studying the history of the mob, you'll notice many inaccuracies. So it's best to take it all with a grain of salt, not take it too seriously, and view the show mostly as fiction that's inspired by real events.