Wow. This is a bandwagon I hate to jump on.
I have to admit that the narration didn't thrill me, either, though I don't blame the narrator's equipment - I blame her annunciation. I don't know if Kara Grace has done a lot of podcast narration before, but she did not have a sufficiently clear way of speaking. Lots of muffled words and swallowed consonants. She did the voices well, however, and brought the characters to life, so I'd just recommend more practice.
That said, I loved the story, and this one had a lot of prejudice to overcome. I didn't like the last Bordertown story I heard on the pods. I don't like elves or faeries (that's right, I called you faeries. You got a problem with it, I got an iron bar with your name on it. Child stealing sons of bitches...). I don't actually have a problem with Cassandra Claire or Holly Black, so I'm at a loss for a third thing to add to the list... Ah, I got it! And I don't like Thursdays.
*Ahem*
Pardon me - got a little carried away there.
Anyway, I really enjoyed this story. The emerging faerie (I said it again. Deal with it!) Batman thing was really amusing, and I liked how the authors managed to humanize the faerie (third time's the charm... for beating your pointy-eared ass) characters without having to bend either the human characters or the plot around it. Alain's backstory was really interesting, and I found myself actually caring about what happened to him. I was also amused by the idea of "the Rowan Gentleman" being a crowd of heroes, human and half-fae, male and female, probably with a wide variety of skills and specialties. It's an interesting way to create a super-hero.
Incidentally, did you know that if you google "zombie fairy" you actually get hits? Zombie fairies are an actual thing.
Weird, huh?
So, in the end, I actually give this four and a half Zeppelins out of five: a remarkably good story that managed to overcome my natural dislike of faeries (Bring it, assholes!) and entertain me thoroughly.