I don't disagree that it's problematic. But it is better than not checking anything at all.The problem with wowpedia though is that you pretty much have to check every line of text for validity, nothing can be taken at face value because people will add random incorrect stuff in with canon stuff that you wouldn’t know is wrong if you didn’t check the sources your self and the citations are often really vague.
One example that comes to mind is the Cenarion Circle where it says that they are outside of the command of Tyranda and ruled by a council which includes Cenarius and has a link to a short story as a source. But if you read through the short story all it actually says is that they are outside the command of Tyranda and it never mentions any council let alone the fact that Cenarius is notable not part of the circle telling malfurion in Curse of the worgen that he will not join and will not lead and that it was up to malfurion and the others to make there own choices.
Some one randomly added the line about Cenarius being a leader and if you didn’t read the random worgen comic you wouldn’t even know it was wrong as his roll in the circle never comes up any where else and wowpedia likely has hundreds of things like that.