Thanks for the comment Bernd,
Very accurate comment: Usability & Content, both combined, will make the difference.
I really agree with this: "organisation of content should be based on sound instructional methods"
Although, Usability should be planned and done from the very first moment, I really do not believe is something .LRN can improve later, at least in the last few years, many new applications, little usability improvements. Sometimes seems like a technical-feature-focused-tool.
I guess the portal-portlet-system concept is just plain wrong for the student-teacher-goals.