They used to be great, but Im not sure how reliable plaguebearers are in the new rules- since they've lost the ability to have regen and ward saves I dont see there is much point of having heralds with them... but its not like the other armies where you can do other things with the heralds.
I think a mono-nurgle list would be very difficult to play and wouldnt be a very strong list... but I've been getting my WE to win and they are regarded as one of the 2 weakest armies around, so Im sure that some people are playing mono-nurgle lists successfully.
One of the staff members in my local shop played a mono nurgle list in 7th which just destroyed everything but when 8th came out he moved to slaanesh which is what I'm doing at the moment but I want to have 3k dedicated to each god
I'm pretty sure you can make a Mono Nurgle list, I have no idea how mind you. I ran up a quick 2.4K list. Lvl 4 GUO, Epidemus, 2 Lvl 1 Heralds, around 80 Plague Bearers and 3 Beasts of Nurgle. It just has way too many flaws to work though.
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