Self res is barley a support clas. It hasn't saved me from anything, nor have seen people use it in crucible successfully. Defenders and Nightstalkers do their jobs way better. Storm trance is useful, but Nightstalker with blood bound is just as good if not better in PvE. PvP they are about the same from what I've seen. But it's definitely not PvP "King". Hunters and Sunbreakers are much more reliable. Nova bomb is.....ehhhh. I'm not saying warlocks are the worst. I'm just pointing out that they aren't the best class. However, if you use a warlocks successfully, use it. It's not for me to tell if you should only use a certain class.