To address 1 thing first : it's sh*t for pvp imo, you would rather take something that gets you kills over preventing death in most scenarios. But as for the rest , I don't play as a warlock but I find your post pretty ignorant and narrow minded. Playstyles vary depending on your class/subsclass , that's how it should be. If your a fragile hunter who has to play a cautious cat and mouse game or a Sunsinger who can go agressive and tow the line, everyone has their role to play and times when they are effective. The Ability itself is not what makes someone weak. If someone is weak, it's inspite of the ability.