Wiki is incredible
Yes, anyone can enter something in there. But, they also have dispute threads to decide what is best should a conflict arise. I have seen it first hand. Everyone watches everyone else, no one man's word is law.
It is very communal, in a sense it is governed by nothing other than one another. No one person reigns supreme, intelligence and understanding win out.
If there is something you don't know much about, and you research it there. You will learn a lot. And probably 99+ % of the time it will be 100% correct.
They cover many obscure topics, and often in depth. The innacuracy talk is just silly. would you rather read it out of a book published a year ago by some team of guys or by a system that is prided by many to give absolute correct info?