One of the things that's been lost in this arbitrary discussion of slopes on greens is how the green fits into the landscape.
On older courses where the greens have more slope, it was possible to set a green into a slope very naturally. Many golf courses have natural contour from 2 to 10 percent, and laying out a course on such ground only required the architect to find some of the flatter parts of the property for his green sites.
If we restrict greens to no more than 2.25 percent, it becomes a different story. Now the majority of green sites have to be graded artificially, so they stand out in the landscape. And if you're playing uphill to the green from 150 yards out, simple math shows that a green surface more than 10 feet above your eye level [450 ft * .0225] won't be visible, because you are looking up to it at more than a 2.25% incline.
I've been in Asia for two weeks, and it's maddening to see how every single golf course has been regraded from wall to wall, with much of the natural character of the sites sacrificed in the process. And I'm seeing the better courses! All these paint-by-numbers approaches to design are ruining the game, one new course at a time.