Someone on youtube correctly observed that cheap to build, as an army, is also a weak army.
Cheap = trash tier
Nighthaunt are quite cheap to get into (especially with the soul wars).
I also observe that usually pretty models are weaker since they don't need strong rules to sell them... NH are quite pretty... bam, double whammy!
What do you think of using small units of glaivewraiths as a third rank for attacking behind chainrasps.
they can also serve other utility roles like remote objective grabbing and character assasination?