Yes true, my thoughts behind the thumbs up and down would apply to scenarios like: Someone asking a questions, and there are multiple answers all quite different and maybe one crazy answer that most people disagree with. They could simply give a thumbs down, to warn the user who posted the question, or at least have them double check first.
The benefits of thumbs up and down would be similar to the benefits of them on Yahoo Answers.
Just my 2 cents
Proceed however you choose fit