I'm sorry to see you go.
I do agree with gwern that your recent critical lamentations have been a negative contribution. Particularly because I find it is too easy to be influenced towards cynicism. However your recent dissatisfaction aside your contributions in general are fine, making you a valuable community member. I never see the name "Konkvistador" and think "Oh damn, that moron is commenting again", which puts you ahead of rather a lot of people and almost constitutes high praise!
I can perhaps empathise with becoming disgruntled with intellectual standards on lesswrong. People are stupid and the world is mad - including most people here and everywhere else I have interacted with humans. I recently took a whole 30 days off, getting my score down to '0', weakening the addiction and also relieving a lot of frustration. I enjoy lesswrong much more after doing that. Hopefully you decide to return some time in the future as well.
Honestly, I think you were too easily mollified by lukeprog - for the reasons I said to him there.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.