My bad marks have come primarily from computer analysis (eg parts testing). I really cocked up one of my assignments and got 44% as well as a 3rd in the Diss so it’s pulled my whole grade down massively.
Being completely honest, and without the wish to over-share on a public forum, it’s destroyed what little confidence I had in my own ability. I’ve found the degree useful but don’t have anything to show on paper for it.