They are not always reliable, but they are mostly. This is because they are written by ordinary people like you and me who don't always know everything, and get stuff wrong.
Wiki answers is always unreliable.
The answers are provided by many hundreds of WikiAnswers users, and there are many thousands that have accurate answers. If you are in doubt about any answer, please research the material. The answers are not always 100% correct.
Yahoo! Answers is also a good site, other than WikiAnswers. But I recommend WikiAnswers over Yahoo! Answers. WikiAnswers is the best Q&A site and it has the best community. Yahoo! Answers isn't always correct, as well, and you cannot change the answers or spellings on there. On WikiAnswers, you can edit about everything to make the site better. Yahoo! Answers you can't, and it is a poor Q&A site.
It is reliable to a point. You have to bear in mind that, due to there being no minimum age limit for contributors, some answers may not be as accurate as they should be. As with any reference source - you should always cross-reference any answer with another reliable source for confirmation of the facts.
China, Japan, Australia, and Antarctica. Did you know that an answer from wikianswers isn't always correct or reliable?
No, you cannot download WikiAnswers' questions, categories, and answers from WikiAnswers. WikiAnswers is solely on the internet, and cannot be downloaded. The WikiAnswers database will always remain on the internet, and for a good reason.
Sometimes answers are not correct on this site because it is open to anyone to answer questions, and not every user is a qualified specialist. Because Wikianswers gives everyone the freedom to answer many questions, they might not always be 100% reliable or accurate. One way to tell if a question is pretty reliable is seeing who wrote the answer which is shown at the bottom of the answer. The more trust points that they have, the better off and more reliable the answer is going to be.
Answers dot com and WikiAnswers get updates every day. Posted answers are always changing. Always look at the bottom of webpages for update date. On WikiAnswers check the Question History.
Well really it depends on if people that answer know these questions as people just put in answers. Some people do know and give you correct answers. Others deliberately give stupid answers, as they think that is fun. Sometimes people don't properly understand your question or misinterpret it and so the answer they give is not correct. Most answers are correct though.
That definitely is not the case. WikiAnswers usually has great, thought out, and well informed answers. Although some answers may be answered nonsensically, that is usually not the case.
You must remember that WikiAnswers depends on people like you and us to give the answers so they might not always be right.
Most of the time, but people are able to edit Wiki so it is not always correct, because people are not always correct.