I've used rubistar many times in my teaching experiences both in Elementary School and for my college students. It is a great site and so easy to create rubrics for all types of activities and presentations. I would have to say that there are some things that cannot be assessed by means of a rubric. Turning the assignment in on time is an example of one that is either a "yes" or a "no." This is not really a dislike, but a limitation to what a rubric is able to assess. I will continue using rubistar 4teachers as part of my grading evaluations for all my students.