I thoroughly enjoyed Blood Harvest. It was a vampireesque tale, without any of the supernatural crap that often accompanies stories of "the undead". These mutants were well done.
I don't know how I felt about Doc's duel with the son where it is an obvious allusion to The Princess Bride. Is it lame because it's a rip-off, an idea already used, or is it funny because Doc is compared to the swashbucklers of film? Not quite sure. Perhaps he got to watch the movie when he was held a prisoner of Project Chronos.
One part in the book I loved, was the final conflict at the end. It was nice to see Krysty's Giai powers come out and Doc leading the rebellion, whilst stoned on the islander's strange concotion of blood and plants. 
Best Deathlands I've read in a while.  I look forward to reading more of Chuck's work.