"horrible sound quality"
Really, really frustating. Not the text, it's beyond me to critique the text, but I had to stop listening because the sound quality was so bad.
I've listened to a lot of books and I learned to deal with a British accent, as I'm sure the Brits cope with an American accent. Generally we understand each other just fine, but I've seen television shows that provided captions for American audiences of British speakers.
While I think her accent is too "thick", it just sounds like the recording is really bad. I mean, I labored under this audio book for many hours. I didn't give up in the first of it's four parts. While I was engrossed in the text, it just got to a point where I had to say "enough" and go onto something else. Too bad.