I think the best course I have seen built on a very average, probably less than average site, is Kingsbarns. Totally manufactured and brilliantly so, but not flat.
Getting to a flat site...Walton Heath Old for me. There are pop up features to break up the flatness here and there, but one never gets the sense that WHO is trying to be something different than what the land is...as is the case with Kingsbarns.
Royal Worlington is another which is on fairly flat land and not enough space for holes at that...so it really is maxed out because somehow there are nine holes. Totally different design approach to WHO, because somewhat like TOC, the land doesn't seem as flat as it is.
Kiawah Ocean is quite flat, but like Worlington, it doesn't seem that flat because of the design features.
Ciao