Best course on average land: Baltray, alot of the land is really flat the further you go from the sea.
That may be so, but among the holes on the lesser land (9, 10, 11, 17, 18 come to mind), I don't think any of them are outstanding. No surprise that the great holes (3, 5, 6, 7, 12-16) are on the great land. The course is, IMO, great despite the area of poor land and what's built on it.
I have found a lot of similarities between Baltray and Deal and IMO, both would be on another level, competing with the best courses in GB&I, were they blessed with another 30 acres of land equal with the best their sites possess.
New Zealand GC takes the cake for mine for architectural genius overcoming a boring site. Perhaps not boring, it's very beautiful, but not suited for great golf.