... which is the other objection to a Wiki. Mind you, I love Wiki. I used to use one (installed on an unlisted server) to keep information about sci-fi novel I'm working on. (I ended up changing the whole format of the world, requiring me to dump the whole thing, but that's not the fault of the software.)
There is so much disagreement about AS, Autism, Psychology, et cetera, that you would run into Wikifights, since it's something that we're all pretty passionate about. For example, someone would post something about thimerosal as being a possible cause of AS, and someone like me would feel obligated to annotate that multiple studies have ruled it out. Then the original poster, passionate in his opinion, would delete my comments and replace it with a phrasing that indicated you'd have to be a total moron to believe those studies. I'd replace it with the basis of the studies, which would be deleted.
See what I mean? Wikipedia has the advantage of a much larger spectrum of articles, so this sort of squabbling is limited to a minority of the articles. But you'll notice that a large number of articles are locked to prevent bickering.
_________________
"And if I had the choice, I'd take the voice I got, 'cause it was hard to find..."
--Johnette Napolitano