I'm pretty sure all of you like a TV show other than iCarly. Wikis based on TV shows are usually made by well meaning fans of the show. However, these wikis tend to be a bit disorganized, with mistakes and few pages, as well as pages created but no content on them.
Some wikis, like iCarly Wiki, Muppet Wiki, Thomas the Tank Engine Wiki, and Percy Jackson Wiki turn out pretty well, but others will have at least one edit before being forgotten.
If you happen to find a wiki about something you like but is extremely disorganized, I recommend you try to pitch in and help make it better.