Ben- The 4th green surface appears to have slid slightly down the side of the hill over the years, leading to the elimination of pinnable area as the green becomes a sloping bowl from back to front. Planning is in the works to 'correct' this issue, although I do not know how much discretion will be used in the reconstruction and/or modification.
Apparently, last summer, a player landed a low running shot over the bunkers in the approach, then it proceeded to run up the right side of the green, catch the back of the bowl, sling around back down the left side of the green past the pin and roll down off the front of the green. This occurance in the presence of a 'tinkering' greenkeeper has lead to the ideas of alteration. There is also a good deal of water draining down across the green from the flanking hillside.
I think I prefer the par-3's at Rye, Cliff, but its really quite close. At Swinley, the added bunkering left at the 13th and the chocolate drops left of the 17th, added as a safety feature for the new (and inappropriate) new tee at the 18th bug me a bit.
Also, not visible on the aerial is the new fairway bunkering and plantings on the left side of 18, which are not good, and the fact that many of the trees behind the 8th green and left of the 9th hole have been cleared by the owners who lease Swinley the property. The highway is now visible and audible, which must detract from the tranquility of the experience, no doubt.