For a series I ultimately did not connect much with, the Plague Herds of Excelis worked really well for me.
First I really liked Iris Wildthyme's return. Not only did it enhance the connective tissue of this story to Excelis Dawns, but I feel like her character worked really well as a foil to Benny. I think Iris is kind of at her best when she has a less-comedic established protagonist like the Doctor or Summerfield, and it left both leading ladies with some great moments here. I only wish we got a little more of their dynamic as they are apart for a huge chunk of the audio, which feels like a bit of a waste.

Still, I found the Plague Herds of Excelis worked quite well as a sequel to the Excelis series. Most of these stories felt largely disconnected to each other, so having a story featuring the direct fallout of Excelis Decays with a lot of plot elements finally resolving a number of what I thought were pretty loose threads from Excelis Dawns, this felt more like the actual sort of building follow-through I wanted from the original Excelis trilogy. The setting was pretty well done in my opinion, making good use of a post-apocalypse Excelis, with a raging plague and roaming barbarians heavily featured throughout the audio. Snyper was a pretty fun villain that had a decent story in him, as part of those ties to Excelis Dawns. I also like how the story gives the vague glimmer of hope to life going on the world of Artaris without compromising the grim ending of Excelis Decays.