To return for a moment to the original question posed:
So, for the average club guy, what golf course would they like more? Not looking for arguments about the value proposition - just the golf course. Is one clearly above the other?
I have played both courses on more than one occasion, and I am an above-average player.
The first time I played Erin Hills, I was not that impressed. The scale and look of the course were cool, and the setting is beautiful, but the rest did not make me feel like I needed to go back again. In retrospect, I caught a bad weather day and I had a two-way miss going off the tee, both of which made for a high degree of difficulty and not much fun.
Last year, when Howard put together the outing there, I decided to give it another shot, and I liked it much much more. Played better and got to experience more of the holes as intended, which matters. Tweaks they made between my two plays were all neutral or positive for me. The bunkering struck me more strongly on the second play than the first. It has a unique look to it, which I dig, and there are some random spots of death which I enjoy in a perverse way. The back nine has a group of very neat holes and I love the closing stretch. Zack Reineking and his crew do a wonderful job on the conditioning. I will make a point of getting out to Erin Hills every year or two.
I have had the privilege of witnessing the development of Sand Valley over numerous visits, thanks to my buddy and GCAer Charlie J, and Michael Keiser. I have walked to course during its development, and played it several times as well.
My first impression of the course was over the moon. It hit all of the C&C high notes for me - strategy, bunkering, greens - but also had a handful of unique holes like the 7th and 17th. After repeat plays, I still love the course, but I am not quite so far over the month. Part of that has to do with what I believe to be a little bit of a lull in the middle (holes 10-13) and part of that is what I would call the Sand Hills effect. I have now played 13 C&C courses, and I enjoy them all immensely. They are so consistently solid that, with the exception of Sand Hills, I must admit to a blending together within the group. Given the level of excellence, I realize that this is completely unfair, but that feeling is there for me, and Sand Valley falls prey to it a bit.
That being said, I intend to go back to Sand Valley at least once a year for the foreseeable future, and if I had to choose, I would choose it over Erin Hills. To put it another way, if I knew I was going to have my best game on a given day, I would rather be at Erin Hills because it packs more challenge and the idea of taking on and conquering a U.S. Open venue is appealing to me. If I knew that I didn't have my best game, I would much rather be at Sand Valley. There is more opportunity for recovery, and birdies still have to be earned. There are not easy holes on either course, but as a whole, Sand Valley is gentler. As a Kingsley guy, it is also a big plus for me that Superintendent Rob Duhm and his crew keep the course in a condition that feels very much like home to me.
With regard to setting and the whole acreage thing, I think I understand Peter's premise about excess, but I don't feel like SV is a good example of what he is decrying. It's important to note that the original stated intention was to create a course that had the grandeur of a seaside links by taking advantage of the "sea of sand" that existed on site. To say that that spirit is off-base is tantamount to claiming that courses shouldn't have been built on the Oregon coast. Choosing to build in the sea of sand is evidence that the Keisers realize that setting and natural beauty matter.
Further, as was the case at Bandon Preserve, the Keisers have made a commitment to environmental sensitivity that many other developers do not. They are making a massive investment in the ecological restoration of the Sand Valley property, and opening it up to multi-use recreation. Michael, in particular, is an outdoorsman, and cares deeply about the environment and giving people an opportunity to get out and experience nature.
Again, the above is not meant as to diminish the excess question that Peter raises. It's a fair question from both land use and GCA perspectives. My direct experience with the people involved and the land tells me that Sand Valley is an inappropriate example.