I -blam!-ing hate warlocks. They use their self resurrect as a crutch and think it is ok to die when they have it. Before you say that I haven't tried warlocks I had one max level then deleted it. My warlock now is level 3 for a reason. I would rather have 3 level 1 characters then a 320 warlock.
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I personally use self res in strikes because you guys cant stay alive and I am left to revive you or stay hidden. With self res I am more comfortable taking risks to revive you since your ghost is probably still being shot at with the weird way deaths work.