Just finished Dark Harvest and it was "ok". It certainly didn't do anything unique besides the fact that it was set in the Mortal Realms.
If you're familiar with horrorstories, you can predict this thing with 99% accuracy as all the characters in it, have their typical roles without a hint of deviation from them. There's the companion who's obviously only in the novel so he can die, for the "oh no" effect. Or the worshipper of something evil, who gets killed by the thing he worships. The novel used these archetypes and tropes like stepping stones, skipping from one to another. It wasn't bad, but not something I'm gonna revisit.
The best thing about it was that it featured an old god and Sylvaneth. Which is a nice change of pace from the usual Chaos worshipping. Which brings me to: Anathemas.
An anthology alternating between stories in AoS and 40k. And it immediately shows why AoS has simply more to offer in this regard as 90% of 40k's stories revolve around Chaos. Even when the force behind the events isn't revealed you still think "That's Tzeentch's doing!". Whereas the stories in the Mortal Realms offer a wider variety of immediate dangers that fit into "Horror".
Unfortunately, the stories are utterly generic and predicable and feel more like exercises in writing for Goosebumps than Warhammer Horror. One of the stories starts out with a case of domestic violence and the victim being sent out to deal with a murder of crows. Immediately my mind went to the trope of the kid befriending the crows and/or commanding them into killing his abuser. And voila, of course that's what happens. Right down to the T.
Halfway through and so far nothing has really gripped me.