I once used it for some coursework I had to do, only a pages worth, about methodology for IT.
A mate of mine did exactly the same methodology, and used exactly the same page I did on wiki.
Teacher failed mine, and I began to question Wiki's integrity when he said that -everything- was wrong. He asked me where I got my sources "Uh.. the internet?" Which led to a priceless quote I will mock for many days. "Well the internet is wrong!" At this point I know he's not quite right. He's teaching IT. I ask where should I get my sources from. He said "Go to the library and read a book!" and dismissed me.
Remember that mate of mine? With exactly the same stuff as me? Yeah. He passed without issue.
I hope I never get that teacher again...