The key difference between the TFWiki and an Encyclopaedia is an Encyclopaedia is written for the benefit of others, and the TFWiki is written for the amusement of the children that write it.
Typical example: http://tfwiki.net/wiki/Rartorata - "Basically, the only differences between Rappakaffalatta and Injector are that Throatwarbler Mangrove has a lighter, charcoal gray plastic instead of Injector's black."
The whole article is much the same, replacing Rartorata's name with something even more nonsensical. Even though it's very lowbrow humour, completely unnecessary and downright confusing to the uninitiated, one of the admins thinks it's funny so it stays.
I've made a few contributions here and there, which seem to have stuck, but I really don't have the patience to deal with the juvaniles running the show.