I think Yeaman's Hall at #38 is quite interesting, and would even suggest it is a GCA favorite. Tom Doak rates it a 5 in his book, and has said numerous times that a good restoration might raise the course one notch on his rating scale. But based on his commentary in the book "Too bad about the greens; fixed up, Yeaman's Hall would be terrific.", I would guess Tom would rate the course a 7.
No rating for Cornerstone, Mountaintop or Rock Creek Cattle. I would guess these are too young.
Colorado Golf Club at #23 is a surprise to me. I've only played it once, which makes it hard for me to judge. It is very difficult, and possesses plenty of "uniqueness". I would like it more if I played it a few times. It also has a great warmup area, although the wramup is a bit removed from the first tee.
I don't like Los Angeles CC (#20) ahead of Riviera (#24). Although LACC has better terrain, I feel there are 3-4 holes which are either nondescript or poorly designed. I wonder if LACC gets stealth points for not being a Fazio/Marzolf renovation.
So far, Bandon Dunes is the most controversial. As an Oregonian, Bandon Dunes has considerable nostalgic appeal, as the first of the great quartet of ocean courses in my home state. It raised the bar for me, and furthered my golf education. I believe the average resort visitor enjoys Bandon Dunes the most, though it would finish third out of three among GCA members. Since Jaeger just mentioned the three holes to the ocean, I'd like to single out #12 as an outstanding hole.