I - I'm disappointed by the number of tear out/rebuilds where I've had the opportunity to see the "before" and "after" components, but for time, timing, or lack of effort I have failed.
I left Colorado too soon to see what became of Mira Vista, Green Gables, and Los Verdes.
I returned to my home area of in Indianapolis too late to see get a grownup look at the proto- versions of The Fort, Woodland CC, The Brickyard and Coffin.
I think seeing totally different on-the-ground takes on identical land is a wonderful opportunity to gain insight into GCA. I'm sorry I've missed most I could or should have seen.
II - Depends entirely on the depth of the analysis desired, I suppose. I don't need to play one more round to know whether I like or dislike something, but every round I play helps me further understand and explain why. Some come by that abilty quickly, while others never seem to learn it - so there does not seem to be a magic minimum of experience.
III - No, because (and here I invite ire, I'm sure) GCA is not the only factor weighed on these lists. If it were, raters would be instructed to observe what's on the ground and only what's on the ground. But most of those lists also have categories for everything from conditioning to service to tradition. They require someone who can offer an informed opinion on many things, not just GCA. To that end, I do appreciate when the publication offers full breakouts of categories and scores in those categories. Some of the things raters rate is of no interest to me. And vice versa. So - if you are going to take the dangerous step of publishing a list, gimme more information, please.