The MOOC model for assessment is that the students do this.
The cohort of 'writers' on the Start Writing Fiction MOOC in its 7th week is probably around the 1400 mark. Of these, let's say 1000 submit their 1000 word piece for assessment. Each of these takes between 1/2 and 1 hour to read, re-read and assess across three criteria. I find a well-written piece with some flaws takes half an hour, an excellent pieces takes ten minutes while a piece that is a difficult read, misses most points taught over the last 7 weeks or simply fails to answer the brief can take an hour. Am i getting that wrong? Am I trying too hard to make up for a student's failure to grasp much or anything at all over the preceding weeks? Perhaps the answer is to seek out some positives: getting this far, the idea behind the writing, a line or phrase ... and leave off either picking through all the problems or offering a summary of all the points they have clearly not got, or simply skipped over the previous weeks.
Not a tutor or AL, though I've had a dozen, this is quite an eye-opener. Good feedback takes time to think through and then to deliver.
The tips on how to give feedback on FutureLearn are succinct. I learnt a technique in sports coaching: sandwiching praise with constructive feedback. This is all well and good. The problem is where it is a huge struggle to find something to praise. Not possible on the FutureLearn platform, my preference I see now, with a couple of the 36+ reviews I've now done of fellow students, is to leave the toughest ones for 24 even for 48 hours. At least then you may get a sense of where the person was coming from and how you speak to them if you had them over for a coffee rather than writing in the quasi-anonymous tone of randomly selected fellow reviewer.
Not easy, but from a student's point of view you have to learn how to take feedback. Occasionally you have have to stand you ground. A couple of times, not ever with The OU, I have taken issue with feedback and a grade and on review it is found that the reader/tutor could not have taken adequate care: posting a set of generic responses on a point missed or references, or saying the essay needed X and Y when, in my case X and Y were introduced in the introduction, covered in the main body of the assignment and mentioned in the conclusion - something I had to do when I was a point off a distinction.
It will be a new skill for students to become assessor, and a new world for academics to allow students to so boldly enter their domain, but a necessary one if we are to 'educate the world'.