First of all I love the new grading system for the exercises , however , as a regular grader , I would like to propose a couple of changes that I think could help.
Firstly - with those exercises that you have to grade and critique based on how close they are to concept art or an existing design , for example with the sharks that we have to grade based upon the concept art - there is nothing to compare it to on the submission page , so you have to open up the exercise itself and even then , the only concept art (as far as I can see , perhaps i'm wrong) is this image here : 
This is all good and well , but the concept art itself is hidden behind Kents (very impressive shark) and two of the other sharks that people are sometimes attempting are cut off. I personally feel like a full size image of the result that is trying to be achieved should be on the page for each submission so that graders can quickly and easily compare it to the submission.
Secondly , for those exercises that require a sketchfab model for presentation - I feel that a standard material that everyone must use should be compulsory for a successful submission. One that is easy to see and shows up and imperfections and bumpy areas. Many users are submitting some very nice sculpts with filters , effects and interesting materials that look very nice - but they make it very hard to read the surface as they are too bright , or not reflective enough.
Just a few suggestions to make the grading process easier :)
Also it would be nice to be able to reply in submissions.
Cause right now I can't write a thing in my own sub and that's a nuisance.
I have experienced several "non" credit for grading items with the new system... where I graded and did not recieve credit for doing so...
I agree the new system is better than the old, especially the idea of rating several aspects of the work
