Great greens are just a part of great green complexes. The flow and tie-in (fit and finish) of the putting surface to the immediate area around them must be seamless. Also, the movement of the putting surface should immulate the nature of the couse in general. Flat greens on tumbling land or heavily contoured greens on flat terrain can give one a disjointed feel.
A great set of greens is one where a common set of principles have been applied to a big variety of complexes. In addition to the surfaces, the surrounds (hollows, bunkers, ridges, swales) need to reflect the strategy of the hole and compliment the siting, shape, angle, size and internal contours of the putting surface.