Once sailed on it predecessor CMV from Cape Town to London, only ship going when we wanted to return.
It was fine, basic edible English food at dinner (buffet exactly same food as MDR), breakfast buffet like a premier inn, OK service, good singers in entertainment all in house. Very basic, but very nice crowd of Aussies going home to see family, so some fun evenings. Made up for lack of anything like luxury.
Good value for money, if low price is your criteria.