I agree with najm1947, it depends what your definition of a "good king" is.  There is no question the Taj Mahal is one of the most recognizable pieces of architecture available on the planet.  If we judge him in that regard, by all means, he has definitely achieved "good king" status.  If we go by other standards, however, such as providing for his people, insuring domestic tranquility, and providing a smooth transition of power, he might not fare quite so well.