Earlier quoted context omitted.
As a former lecturer, I found that student satisfaction often came down to things like how "easy" the lectures are. Big name universities like Oxford traditionally haven't (until recently?) felt the pressure to hit these objectives since they can ride on their reputation.
I friend of mine was a lecturer, and she set exams and tasks which explicitly tested the students' understanding of the material she was teaching, as you would expect - scores for her tests followed a bimodal distribution - indicating that they were working. She got terrible satisfaction scores, and got pressure from 'higher-ups' to reweight the exams so the people in the "fail" group passed.
The reweighting is not a good solution, but I would ask questions to the lecturer why a good chunk of her students are failing. It's her responsibility to teach them after all, and not to filter out the elite.