I would be interested to know when these rankings were done, because while I am an admittedly biased fan of the New Course at Sunningdale, I think some of the recent work done to the course really does not help. There has been widespread gorse bush removal, which has made significant changes to the 1st, 4th, 8th and 17th.
Most significantly is the noise impact, a load of bushes and trees on the right hand, far side of the 7th tee have been removed, which means that now you can see cars on the nearby road, and really hear them too. This noise of cars now can be heard on large parts of the course and really detracts from the serenity and calm that one used to feel.
The bushes in question were not ever in play, but I feel that their noise deadening qualities weren't appreciated before they were removed.