I think overall the wikipedia model has shown itself to be decently working. But (anecdata) I have my gripes with the way it handles evidence. My SO has a person (died already) in her family with a (relatively) short wikipedia entry. There are factual errors in the article. We know that, because we have original documents showing that the "facts" reportet in the entry are wrong. Due to the fact that the documents can…
Since this person is family, you can issue a publicly-available statement, e.g. on a website, and it will most likely qualify as a reliable source by Wikipedia's policies. The point is that Wikipedia must never be a primary source for what it writes about; it just always be able to point at a source for what it says. Wikipedians' job is to broadly evaluate and curate sources, not guess at the truth of any individual…
I don't need the facts to be in the entry. I don't care. I only care about the fake facts in there and ask myself how much of the rest of Wikipedia is also riddled with falsehoods and nobody would want to remove that if shown actual state documents that show what is wrong.
I did not want it to become a primary source. I just hoped they would remove information that has new evidence not known to the original source.