When I say that “the real problem” of Wikis is that they don’t have WYSIWYG editors I mean in the context of formatting. As you point out there are certainly more problems with Wikis than just the formatting but this is the problem that ties into the abundance of plain text formatting languages.
If you pressed me about what the big problems with Wikis were I’d point out that I’m not nearly as qualified as other ArborBloggers to weigh in. cough cough If you held a gun to my head, I’d say that the two biggest problems for Wikis are both “Edit This Page.” People who might deploy a Wiki are paranoid about anonymous collaboration and people visiting don’t really believe that they’re supposed to edit pages. There aren’t any technical solutions for etiher of those, so I’ll just stick to pontificating about WYSIWYG editors.