How I Use It
As a teaching tool it can be powerful and easy to use. If you create an account you can save your rubrics online for others to use. Perhaps students could create their own scoring rubrics for different projects to get them thinking about assessment and differentiation. If you need a quick framework for student work/projects this is a good place to start.
Rubistar is easy to use and you can find several rubrics created by other educators. If you know how to write a strong rubric that leads students to the desired outcome it can be a great tool. If you don't know how to do that then it could hinder student learning. This is really a teacher tool but there could be some student use aspects.