Wayne,
At least one of the old guys, probably MacKenzie, weighed in for long slopes vs. the "puny" little interior contours, if I catch your drift right.
Despite the current popularization of "internal" or "random" green contours by a few architects, I suspect most players prefer the long slopes starting outside the green and working their way across. As Jamey says, they affect the approach shots as much as putts. And then, when putting, I think most players would say a long slope (or even interplay of long slopes) gives them a chance to make a putt, if properly read and stroked.
Do random contours allow that? At some point, if there are numerous little bumps and hollows, it crosses over to impossible to read, thus negating the benefits to a degree of strong iron play, and making it more luck than skill to make a putt, no?
Related question - is defending par at the green with green a good thing, or does it throw the golf course challenge too far out of balance with putting/short game over accuracy?
Lastly, I think it depends a bit on the site. If there are a lot of humps and hollows everywhere else, an internal contour green might fit in. On a gently rolling midwestern site, I think the long slopes working into the green from the edges may look a lot more natural.