It does look a little more complicated than I thought. I set up a rubric but saw it more as feedback than a rigid grading criteria. For example I may set volume as something I could comment on but assigning it a grade alongside originality and a compelling presentation would not be fair. It may be able to make it work but a piece of paper works better - and since I do it in class, why not give feedback directly to the student rather than entering it on Moodle?
I also have to keep the mysteries of Moodle away from my students. My trial assignment popped up a message telling me I had to submit, something which would cause student confusion. I am sure I could suppress it but it is another example where I have tried something new and had unexpected results. I don't think I have time to adequately create and test this activity,