Personally I don't mind the narrator at all, actually I rather like her tone and delivery. But if there is something I'd like to see removed, it's the "He says" unwritten lines that follow the gods' dialogues. I find it jarring and unnecessary myself.
The thing is, though, that there are other people who play this game. That you don't mind the narration doesn't mean that many people wouldn't benefit from and enjoy the option to turn it off.
I said the above to state my opinion about the narrator, not to argue against there being an option for turning the narrator's voice off. More to the point, though, I was going on a bit of a tangent myself, as you are about full voice-over (and which I generally disagree with too - I think it added a lot of immersion to the game and was by and large very well performed - and whilst I see the value of leaving much to one's imagination, I also believe there is great value in a performance as a means of delivery for those lines), and was actually addressing my one gripe about the narration which are the unscripted "they say" lines that follow each of the gods' dialogues.
So, more on this minor gripe of mine since I was writing from my phone in bed yesterday... I'm struggling to figure why they felt the need to add these lines into the voice-over and not to the text itself, this feels like a last-minute addition perhaps driven by a feeling that the enunciator of said lines wasn't clear enough? Though it's strange, because not only does the writing present each character pretty clearly, but the identity of the enunciator is further corroborated by the very distinct voice performances for each and a solid visual aid, whereby the enunciator is always in colour against an otherwise monochrome illustration. It is especially jarring too because unlike any other piece of dialogue or narration in the game, these moments are unique in the game inasmuch as they are the only situations where we have voiceover but no written text - so why not add said text if the devs felt the need to further clarify the enunciators and so on? This is a weird choice all around, not to mention a superfluous addition, and which feels distinctly out of place with the decisions taken throughout the game regarding text and voicing otherwise.