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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Warlocks are really easy to use. I main a Hunter and consider Warlock my worst class. It is so easy to slaughter people. For the most part, they are balanced. They have some broken abilities *cough* Stormcaller melee *cough* and others need need a buff. They're not necessarily OP, but are more consistent than most other classes so they out perform everything else.