1. Low rating for the content:
The author frequently operates with abstract symbols, formulas and abbreviations.
This is OK for a written text book, but is virtually impossible to follow when the
medium is restricted to acoustics.
Without doubt, Bayes theorem is difficult to "visualize" solely by oral means. But if someone
undertakes such an approach, I would expect a bit more than just a stream of probabilities,
prior probabilities, conditional probabilities, ...
See for instance Brian Greene, Fabric of the Cosmos, where difficult matter is elegantly
transformed into a form that is simply a pleasure to listen to.
I also don't think it is wise to introduce and refer to symbols in an audio book.
In my opinion symbols, abbreviations, unless in common use, should be avoided in oral presentations altogether (even if symbols are used on the visual aids). For an audio book referring to symbols is simply not appropriate.
The author sometimes just cites the Bible, e.g. "Mark 1 2:3, Luke 4 5:6, ...". Personally, I feel quite proud that I managed to work myself through a good deal of the Bible. It was a really tedious business, but having done that I am far of having memorized it. Again this is not appropriate for an audio book.
So, I guess, in order to turn the content into a sound audio book some modifications of the original are required.
2. Low rating for the speaker:
The oral presentation is a plain lecture. During the earlier chapters there comes a feeling that the lecturer presents his stuff to an audience that is "bound to listen". When approaching about the half of the book this feeling gave way to the perception "now even this audience is gone" and the lecturer is "lecturing to himself". I can imagine that it is difficult to just sit in front of a microphone, alone in a darkened room, ...
Still, in order to induce a pleasant experience in an audience that is limited to just hearing without any visual aid, the speaker needs to be aware of that at every instant.
The pitty is that most certainly the speaker has the capability. But unfortunately he drifts into a hasty "I need to get my message across" where a narrative approach with an attitude "I have the pleasure to share some of my time with my audience" is needed.
3. Lower rating for total:
After listening to a couple of Bart Ehrmans books (narrated by Walter Dixon, Jason Gulp, L.J. Ganzer) I was really looking forward to this audio book, but it was simply disappointing. So for anyone who is interested in the matter: you will need a written copy.