A couple of reasons why you got killed by one and are now coming to the forums to complain about them:
1. You are bad at the game and don't want to form a way to counter them.
2. The warlock who killed you plays their class very well.
3. Coming to the forums to cry for nerfs just proves that you are bad.
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They're balanced for the most part. The storm caller melee while inconsistent should be looked at. I've gotten some pretty cheap kills that made me think about it. For instance while on balcony in banner fall I meleed a Titan under me even though I couldn't see him and killed him.