Many organizations these days use wikis to allow people to collaborate on projects, and documentation. Problem is, the out-of-the-box wiki works, just, for assembling pages of unrelated items, like an encylopedia. For anything more structured however, it falls well short.

For what it's worth, I think there are two main problems with wikis:

Specialised markup language.
When you want to create content in a wiki, you need to learn a special markup language, especially if you want to do things like bold or italic text. Worst still, it is a real effort to cross reference other material. (I'm not saying it can't be done, except for the average person, it's a bother)

No document structure.
Unless all users are disciplined, a wiki quickly degenerates into a random collection of individual pages, with no logical structure. This works fine for large collections of disparate information (like an encylopedia), but today, it is probably not the best tool for organising content in a logical manner.

Today, we have better tools available, and they make collaboration easy and productive.

Like this website for example.

It is built on the "Drupal" Content Management System, which is a modern, extensible web framework which allows content to be easily entered, and also categorised, sorted and displayed in various ways.

It's easy to add content, using HTML - the language of the web, and there are a number of text editors available to make the task of adding content very easy. Importantly: you don't need to be able to write in HTML in order to produce nice looking content.

The site itself also has some nice features, and being a "framework", its easy to customise. On this site for instance (at the time of writing anyway!) On the front page, you will see a listing of the most recent articles, as well as the most recent forum topics. In the right hand sidebar, you will also see the most recently added comments. All these things are added automatically by the CMS, as content is added to the site.

No arcane markup language to learn, just a great web framework which showcases your content.