Good design is not for me to judge; it’s more of a customer satisfaction metric.
After years of experience designing and evolving products I can give a good heuristic evaluation of a particular design with the aim of improving an existing solution. But heuristics don’t come close to evaluating whether the solution truly suits a customers needs and wants. The only way to do that is to gather data, synthesise the data, create hypotheses, test the hypotheses, learn (and repeat).
Good design brings maximum value to customers. Good design is always evolving through continual learning and improving.