One person leads the discussion. They prepare questions or use the ones listed in the back of the book. Everyone goes around and talks if they have something to say.

Usually there's light refreshments or people bring stuff to share. Kind of depends on the location though, might not be allowed in the library.

At the beginning everyone might introduce themselves and there might be a break in the middle or at the end where people just chat.

It's not that they are less talented because they narrate by reading in a straightforward manner, it's a stylistic choice. Not all narrators have a boring monotone. There are also plenty of "performers" who irritate me and I cannot listen to the audiobook. There's times when the content matter doesn't lend itself to someone acting things out.