This is an interesting question...
Look at the courses ahead of it:Pine Valley, Cypress Point, Pebble Beach, Augusta National, Shinnecock Hills, Pinehurst (No. 2), Sand Hills, Merion (East), Oakmont, Seminole, Winged Foot (West), San Francisco, Prairie Dunes, National GL of America, Crystal Downs, Oakland Hills (South).
I think it is interesting to note that only 2 of the courses were built after the Great Depression, Sand Hills, Prairie Dunes. Meaning that you have the greatest work of the greatest golden age architects ahead of Pacific Dunes. Of this list, I am only inclined to say that PD should not be behind Oakland Hills, but that is just personal opinion. In addition, Doak's best work is ahead of the best work by Dye, Raynor, Thomas', Nicklaus, all the Jones'. Tom Fazio, Wieskopf/ Morrish...
That is pretty amazing. Based on that, you could probably argue that PD might be ranked too high, not low.
As far as the course is concerned, I think it is lacking interesting par 5s. With the exception of #18, I found the other par 5s to be very similar and somewhat uninteresting compared to the rest of the course. Flat ground with little to challenge the tee ball and second shots.