I would personally rate wiki as "very accurate" in an overall sense. I regularly use it as my reference tool, and other than referring to a reference that is specific to a particular topic (usually less convenient), I don't think it has a peer. Brilliant resource and "very" (but not 100%) reliable.
Bear in mind that no reference resource is 100% reliable unless it pertains to a narrow topic. Even then it can become out of date. Wiki has them covered.
I was surprised to hear a couple of years back that school students (my nieces in particular) were not allowed to quote wiki as a reference for researching their projects. It was considered too unreliable. Wonder if the 20 year old books in the library are "reliable" :-)
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