I replyed with dying. They are good at dying...
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Ok so after 100 comments or so I have concluded that warlock are useful at crota by cheesing the totems by dying... and they helped in VoG by um... dying BUT let's be fair here when you play as a warlock self res is a thing for them so dying is only natural for them as it shows of thair best contribute.
Now you may even say that they create orbs, well so do hunters with shadow shot mixed with light of the pack enabled witch even goes as far as to Holt adds and create a damage buff for not only themselves but also the rest of the fireteam.
So in short I'm not hating on warlocks I'm just simply stating what thair only use is.
[spoiler]unless I find them in crucible... dear god thair far to OP in crucible[/spoiler]
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[i][b]They're [/b][/i] good at spelling too.