So a person reading an audio book to you is bad, but a machine voice reading an audio book to you is good. Is that you point? Well Phil, that has been discussed over and over in the customer discussion area at the bottom of the main Kindle page.
This section is for product reviews. So what do you like and dislike about your Kindle? Review the features you find useful. But don't review features the Kindle was never intended to have. I'd like my car to fly, but I don't see the point in writing a product review about that.
If I'm going to listen to an audio-book, I'd MUCH rather hear a human reading it than some silly text to speech converter that has no clue as to the emotion required for a given word, sentence, paragraph etc.