[dredmorbius]

Mostly talent, production, and editing.

I've listened to a few Librevox recordings. They're usually (though not always) tolerable. Occaisionlly good, but that's exceeding rare.

Good audiobooks -- and a friend listens to many -- are far more often vastly superior. Even then, a poor reader is exceedingly grating.

Libravox may improve with time. History of volunteer efforts has been compeling. But not yet.