Taking your comment at face value.. XiXiDu is saying he doesn't want feedback through karma at all, but through comments.
That is only part of what I have been saying. I want people to be honest and free. Karma causes a strong positive and negative incentive to agree with the currently popular opinion or to stay quiet.
I just watched Transcendent Man about the singularity and Ray Kurzweil in particular. It's well-made, full-length, and includes the most popular criticisms of Kurzweil: that his prediction timeframes are driven by his own hope for immortality, that the timescale of his other predictions are too optimistic, that his predictions about the social outcomes of revolutionary technology are naively optimistic, and so on. Ben Goertzel and others get much face time.
You can rent or buy it on iTunes.