Well they aren't great outside of the malign portents rules, but they are cheap points wise so I find it appropriate. The Ordinator obviously has use alongside Ironweld, the Fungoid shaman is a great ally for a cheap wizard that some destruction armies can't get otherwise (Beastclaw, Gutbuster, Ironjawz), the Darkoath Warqueen is just a cheap hero that can jump out and punch above her weight on monsters/heroes and be no big loss when she dies.
Then there is the knight of shrouds. He is awesome and auto-take for Nighthaunt armies. His ability gives +1 to hit to models that universally do mortal wounds on hits of 6+. Spirit swarms, hexwraiths, cairn wraiths, etc will all be doing mortals on 5+. It also means Nighthaunts can actually deal with hit penalties now.