The bell-shaped curve approach works.. for a bit: 32,000 worldwide courses = 3200 courses with an A grade. Ok, too many. 320...maybe. Until the CG or Bo Derek came along and changed the perception of what was Great. Is a 91 on a golf Course scale really a Doak 7? Coore is probably close to right in that the number varies...but I like 150 courses, with adjustments to skill, temperament (hard v fun), daily condition and preferences (F&F, eye candy, match play vs stroke, etc). Big world and all that stuff.
Pinehurst #2 gets an A grade but is too hard and one dimensional to replace any top tier fun U.K. courses.