Caveat: this is an annual collection and I'm afraid the books don't have their volume number printed on them anywhere. I chose "vol 5" from the good reads options because of the copyright date, but I could be off!
The collection is, indeed, "mammoth" with 30 stories of varying lengths, some quite long. My favorite of all was "Daphne McAndrews and the Smack-Head Junkies" by Stuart McBride. It was the eighth story in the collection and so good it's rather worth slogging through the more forgettable stories. The first five stories, in particular, were dreadful - but I'd packed the book as an in-flight read and had to forge ahead or be bored. Good thing, as I said, the eighth one was a charmer. I suppose it's hard to go wrong with a retired lunchlady and her elderly Westie confronting the criminal element.
"Distilling the Truth" by Marilynn Todd was also quite good - and not just because it was set on a cognac distillery. nom.
"Jade Skirt" by Simon Levack and "The Curious Contents of a Coffin" by Susanna Gregory were good historic mysteries. I particularly liked Jade Skirt because one doesn't often get Aztec historical mysteries.
A lot of the other stories had memorable bits. One in particular I loved right up to the end, where it seemed like the writer hit deadline and just smashed the story with blood to get it done with. A few felt like they had no story at all. "The Bookbinder's Apprentice" for example I found to be a very long and boring exploration of a cliche'd story.
So... yeah. Mixed bag, really, but the winners definitely entertained.