I've listened to a BUNCH of audio books. (I've got a 1 hour commute each way)
I can't wait to do mine. (I love the sound of my own voice, so I'm gonna record all mine...Okay, maybe not LOVE, but I've got a decent voice)
In listening to audio, I've found the pace makes a HUGE difference. Yeah, it's nice to gt a resonous voice, someone who enunciates clearly, but they also have to read the thing with the right pace. I've gotten some where the narrator went a little too slow, and it it gets hypnotic and puts you to sleep.