I think Tommy makes a great point....interesting green complexes and surrounds can take a course on an average site and make it extremely interesting and unique. I find that my favorite golf courses are those that present a lot of short game interest and let me use some creativity. These courses never get old, they always hold your interest.
Tillinghast was a master at elevating the quality of a golf course through it's green complexes. His layouts at Winged Foot, Baltimore CC, Fenway, etc. are on good but not great sites, yet the brilliance in the greens is what truly elevates their stature among the best of the best.