If usability is the problem and the target audience is non-geeks, WYSIWYG outperforms Markdown. People are used to toolbars with formatting buttons, but Markdown is a completely unknown markup language for most people (even the "markup language" is completely unknown!).
I had to explain the Markdown-lookalike Viking syntax for non-geeks at work, and they don't like them. When you want to write something, you want to write something, not look for the strange ASCII syntax. Try not to interrupt the flow of users.
I would find a good WYSIWYG editor, such as the one in WordPress ( TinyMCE ). It is working fine.
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