Yeah, in case you have never noticed, most warlocks use self Rez in PvP/PvE. In PvE it's [b]can be[/b] good in nightfalls and raids. But most of the time it is useless and does not generate orbs. Same goes for PvP. Die, Rez, Repeat. Now if you're going to use it whenever it's different. Because titans have striker to clear out huge amounts of enemies and bubbles to hide in. Hunters are the best against high priority targets in raids or nightfalls (Using gunslinger). And nova bomb can be useful and team supportive but not as much as the other classes. Even bladedancer can go invisible and revive. I say lack of team support because compared to the two other classes, they have less uses for their teammates. This does not mean they aren't team supportive, because a minority of titans and hunters are not team supportive builds just like there's a minority of warlocks that have a team supportive build. Tl;dr The other two classes are usually more supportive then warlock.