Yes, but it wholly depends on the contributors and the categories.
There often are good answers on WikiAnswers. Though many trolls will give useless and misspelled answers, W.A. strives to be a reliable source of information for all users.
There are many good answers on wikianswers. Unfortunately, as with any public wiki site, there is a risk of vandalism and unintentional wrong answers.
Yes, there are some videos on Answers/Wikianswers, but it is mainly written answers at this stage.
Unfortunately we cannot give this question an accurate answer, but I must reiterate that WikiAnswers enforces a strict anti-plagiarism policy. Any answers that are plagiarised should be reported and will be dealt with accordingly.
The reason WikiAnswers does not have any pictures in answers is mainly for legal purposes. Most images these days are copyrighted, and cannot be posted on WikiAnswers. Thus, WikiAnswers sticks to the text-only answers it uses today.
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.
There is no reason other than faith in the word of the answerer; it is always a good Idea to get a second opinion on any problem that is important. WikiAnswers does discourage people that deliberately give bad answers and they are eventually filtered out as they can be edited later on by more knowledgeable contributors.
Yes. WikiAnswers is made up of people like you and me. But it depends on who answers the question. There are some who don't give a good answer, and then there are people who truly do their best to answer a question. I would say, if someone doesn't like the answer they got, then rephrase the question and ask it again.
Wiki answers most of your questions but not all of them!!
If you ever find any of the answers on WikiAnswers to be wrong, just replace the incorrect answer. We all make mistakes, even the best of us.
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I looked at your other questions and almost all of them have been answered and have good answers.