Imho, they're valuable as independent classes, however one major flaw of the Warlock that I found odd was the Transformations list which gives you natural weapon, you need to develop independent OBs for each of the type of attacks, at an insane cost in DP (Special Attacks iirc, whereas the Warlock has semi-decent costs for Martial arts), so everyone in my group who looked at the list agreed it was stupid for a Warlock to raise that particular base list.