In the page and description rich text editors, you have a ton of buttons, but in the comment writing toolbar you only have Bold, Italics, Underline, Strikethrough, External link, and Smiley.
It's missing a handful of key components (by default) to encourage users to write readable, well-structured comments:
Possibly the headings buttons could be useful to have too, but you would need Tiki to handle them being at lower hierarchical levels than the main page/tracker's headings (for SEO etc.), and/or style them differently so they're not visually overwhelming...