When reading comments, is it not more useful to prioritise the actual comment rather than the person making the comment? 

Sites like StackOverflow have the user as subsiduary information. The actual layout is obviously up to a site owners preferences - no matter which one the plugin ships with it will never be the right one. Areas such as this should be based on a config setting rather than the need to adjust core code, but that is a future feature request I guess. Personally I prefer the comment showing first, followed by the user data.