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It's interesting that you say that hc4361 because I live in France and they have their version here called "A Dinner Almost Perfect" and the contestants are all normal but tend to be good cooks.
They mark out of ten for the food, table decoration and for entertainment, so a maximum of 30 marks/person. It's a very popular show here and very watchable and it certainly goes to show that you don't have to have unbalanced people or those with super egos to make a good show.