The things written here are not rules. You likely won't get banned for doing what is advised against here, but you might get called a faggot.
Don't suck someone else's dick!
Imagine that there is a writefag or whatever that you think is really great. So great, in fact, that you decide to immortalize him by putting up his shit on MulpWiki. You create an article that praises his work and expresses how awesome it is. Soon afterwards, an anonymous user sees the article and thinks to himself: "Wow, yet another attention whoring faggot that fellates himself because he probably never achieved anything else in his life."
Articles generally shouldn't rate their own quality. Each article has a Discussion Page where you can vent your opinions if you need to, but don't do it in the main article!
In general, be careful about changing large portions of a page, especially if your own knowledge is limited.