One of the most important things that I have learned from Wikipedia is to think in potential. Forget about what it is, and think about what it could be.
When a debate arises over whether or not an article on Wikipedia should be deleted, it is judged on how worthy that article would be in its best form, not what it is now. Two sentence articles are often kept, while multiple paragraphs are gotten rid of, because if nurtured those two sentences could grow into an extremely educational experience for someone.
It is understood that Wikipedia is always a work in progress, just because it isn’t great now doesn’t mean it won’t be someday. Life is the same way.
It may even take some convincing. There aren’t many people who knew that the metal umlaut article could become what it has, but its writers were so dedicated that they not only wrote an article, it even became a Featured Article—the highest quality articles on the site.
If somebody doubts something based on what is, forget about what it is, and think about what it could be.