BeBoldInUpdatingPages
Wikis don't work if people aren't bold. You've got to get out there and make those changes, correct that grammar, add those facts, make that language precise, etc., etc. It's OK. It's what everyone expects. Amazingly, it all works out. It does require some amount of politeness, but it works. You'll see.
OK, you folks still don't understand, so let me make this clear: if someone writes an inferior or merely humorous article or article stub, don't worry about their feelings. Correct it, add to it, and if it's a total waste of time, outright replace it! That's the nature of a WikiWiki, and long live WikiPedia!