Feedback is just as important as the content. Immediate feedback and instructor comments need to be specific. Whether this is constructive criticism, suggestions to further learning, opportunities for re-teaching, or all of them together will help make the student an active participant in the course verses a student who goes through the motions. Genuine feedback can easily be shown in the information written back to the student. Generic feedback will turn students away. Just because we are not f2f doesn't mean you aren't part of a class, we need to make that happen--feedback is that avenue.