One of the first thing I do in Hacker News or Reddit when seeing sensational headlines (cancer can be cured!) is checking the posts to find out what's wrong with the claim. In most cases it's the highest voted comment. I think Kickstarter would profit from a similar moderation system. Posts where users can add flags like "will work" "won't work" and some voting system so you can easily see the highest voted comment(s) with one of those flags. Or alternatively a normal forum to allow real discussions about projects would also be a major improvement. Although there needs to be a careful decision then who can cleanup spam as you wouldn't want project moderators to allow removing all critics without any consequences.

The currently used comment system there is just horribly insufficient - it's basically impossible to have any real discussion there.