Hunters have a really good aggro wipe, and a good amount of their damage is on their pets, meaning that they really shouldn't pull aggro at all(unless they have no reductors, which seems the case since FD is so "usable").It's best used on classes without full aggro wipes, like Berserkers and Retadins, I suppose.. Even Warlocks. My main is an affliction warlock and I can tell you: my threat skyrockets even with destructive reach AND improved drain soul. Anything that lives a full dot will likely have me on the "105%" threat value, above the tanks(and very good tanks, mind you, we take pride on all of us with the results we've brought so far), and relying solely on Soulshatter is not very good.
For warlocks, the blessings benefit are more or less like this
Salvation
Kings
Wisdom
the Rest
Kings gives us more hp/mana, and it's good solely for that. Wisdom won't help when we have life tap, specially if improved.
Meh I went a bit away from the hunter focus, but It's good to make it clear what locks generally want

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