I think I can give a qualified opinion on this subject, please let me explain.
I have nearly completed the Computing and IT BSc (Hons) at the Open University (OU). I have a BSc(Hons) Biochemistry degree from Leeds University (2i), a PhD in computational fluid dynamics from Leeds University, and some years ago I got AAB at A-Level.
My experience of the grading at the OU was that I was able to get higher marks in my coursework (often it’s been in the high 90s) than I’d been able to get at Leeds. At Leeds I’d normally be in the 60/70 range. But in exams this was all wiped away.
For the higher mark in the coursework I am not sure if this is the university or the course. Let me explain: part of one question within computing might ask me to redraw a sequence diagram as a communication diagram for which I could receive a maximum of 6 marks. If I do this correctly, I get 6 marks. Extending this, I could potentially get 100% if I don’t make any errors in the rest of the questions. I know when I did biochemistry I’d give an essay style response to a question and the marker would decide whether I’d given a first response or a 2(i) or whatever. In my experience of mathematics/computing courses there is a potential to get 100%. Had something similar in Biochemistry where in a course on IT, Maths and Statistics I got 82%. Highest mark I ever obtained at Leeds.
Is the OU easier to pass? For example, in M359 a 30 credit level 3 module the material to read and memorise was the equivalent of a 6cm thick textbook. As well as the course text in computing modules there are also practical activities to work through and also try to memorise. So if you did this full time there would be a requirement to learn four 6cm thick textbooks in 8 months with additional practical material. As a comparison at A-Level (old school) you’d be required to learn four 6cm thick textbooks in 2 years. Here you get 8 months. Also what I found was that if you’d chosen full time you’d have to sit 120 credits of level 3 exams in one exam period as all modules started for me in February and all 120 credits were examined at the same time in October instead of having two exam periods a year as in traditional universities.
Come exam time you need to know the material. If you get 100% in coursework and only 40% in the exam you will get 40% overall, or a grade 4 pass. At Leeds if I remember correctly I had a 60:40 split for exams to coursework but at the OU your coursework is not added to your exam mark as in a traditional university. For people who don’t like exams the OU is not for you.