Considering most raids center around not dying, I'd say self-rez is fine. It is certainly better to not die in the first place but no one can guarantee you that. DPS comes from rockets + snipers, not necessarily from supers; they're more for clearing mobs which a rocket or grenade can easily replace. I play with randoms quite a bit and it is reassuring to have warlocks that can self-rez. In random groups, there isn't much team strategy/cohesion anyways lol...I'd say dying lets your team down more than anything else.