All threads and posts will now display "Was this post helpful?" With a thumb up and thumbs down.
This is great, why? Popular posts will get surfaced, and guess what happens to posts with a negative rating? They get hidden. This will allow the community to peer moderate and easily be able to get rid of crappy posts judged by YOU, not just the moderators.
What happens if someone abuses them? I ban them. I can see who is abusing it. I can see who is abusing it by looking at upvote and downvote ratios.