I once read an interesting article on how OkCupid was doing question weighting wrong because people would mark matching on factual questions (like, "What is the largest of these? A. Elephant B. Whale C. The Moon") as being absolutely vital to get correct. People would then end up with like 90%+ matches with others they would not really get along with, just because of the ridiculous weighting on those questions–it became a matching system more like, "who has answered the same questions as I?"
