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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If you were truly confident in the skill you possess you wouldn't have come to the forums in order to try and convince others that warlocks are skilled players. No, what's really happening is people are calling you out for playing the easy class and now you're fed up because you have to prove through the validation of others that you are skilled. If you truly believe what you are saying then go ahead and top the lobby as a defender Titan, that shouldn't be too hard for someone of your "skill".