I can't tell if the DLC was just not very well sold (based on the #'s of people playing the onslaught maps) or those playlist don't have a ton of people because nobody wants to be stuck playing game modes they don't wanna play.
Also, one of the hunted playlist had like 200 people in it yesterday, meanwhile games like dom had like 5000. I would love for them to get rid of it and bring back a game people want!