Paradox
Then why do they call themselves something that today is used to mean somthing that does have an authority e.g. "an encyclopedia". Sorry but they are claiming they have a certain authority if they make the claim they are an encyclopedia. ...
The paradox of the Internet is that while being one of the best sources of reliable information, it is simultaneously one of the most unreliable sources of information.
Just because something is called an encyclopedia, doesn't mean it contains authoritative information. Some are full of pseudoscience too and provide no worthy information at all.
Wikipedia has given me no significant problems with accuracy so far, but like most people, I've only examined a very, very tiny portion of its total content.
It is nothing less than an art in itself in knowing what to believe or what seems to be believable and how to do essential follow up research to ascertain the likely reliability of the information you find. That comes only from experience and a genuine desire for knowledge.
Anyone who relies entirely on a single authority is a very inept or lazy researcher. Competent research requires at least some degree of cross verification. No source should be presumed to be absolutely infallible regardless of its reputation. Bogus data has been known to slither into even the most prestigious journals from time to time.
Since I specialize in science, math, programming and logic I don't tend to be fooled as easily as most when it comes to bogus data, pseudoscience and superstitious nonsense, whether from Wikipedia or some other source. I'm certainly not infallible, but I'm definitely not easy to fool either. I've learned quickly from my mistakes and even more by studying the mistakes of others as well.
So far, my biggest gripe with Wikipedia is that many advanced technical articles lack references to some of the data presented. Being a hard core factualist steeped in rigid scientific discipline, I prefer to see some references to other related research on the same subjects.
The general public is abysmally ignorant and gullible and nearly devoid of anything that closely resembles critical thinking. As nasty as that sounds, it's a simple fact of reality that observations of the odd things that people believe in too readily quickly verify. Ugly, but true. This fact is what makes Wikipedia a bit hazardous for public consumption and why it should be policed periodically.
It would be unfair to discredit Wikipedia in its entirety as being too treacherous to rely on at all. Simply don't except it or any other source as the final absolute authority on any subject and always carefully cross check the important facts via other sources prior to making any important decisions based on the information.
What I find most disgusting is that there are so many legions of information vandals that try so hard to ruin things and corrupt the information and abuse the freedoms the internet provides.