If you're unable to do enough damage to justify your raid slot, that's your problem.
Warlocks having a higher top-end is not news to anyone, it's been that way all expansion. Big deal. Point is, you can still compete or beat *most* warlocks that you encounter, or at least be similar to them.
I consider my warlock buddy Ludox to be very highly skilled, though not necessarily as padding and sniping focused as a lot of locks out there with ridiculous parses. I compete with him well-- beat him quite often as described in my other post.
What I see out of a number of people in this thread is a rationalization for bad play in general. So quit whining and learn how to play better. Post your parses and I'll help you out by pointing out all your inefficiencies and failures. That's not a spiteful remark, I honestly help people in this community, not just chalk up low DPS to some other class being better designed. Or here's a thought, maybe you should all at least hit 100th percentile once on a fight before you complain about another class. Kind of foolish to whine about your potential DPS when you've yet to reach maximum.
I think it'd be best for any "warlocks are better lol" post to be locked as soon as its made.