Tom MacW:
While it may be interesting to try to establish quality of architecture via where majors have been held I think that fact can be more than a little misleading.
It seems to me that majors have been held at various courses as much or more because the clubs very much wanted to do that---not necessarily because of the perceived quality of the architecture of a course.
One can point to the Merions, Pinehurst #2s, Oak Hills, Oakland Hills, Aroniminks, Oakmonts, Baltusrols, Winged Foots, Rivieras, ANGCs, Pebbles but one can also point to the Pine Valleys, NGLAs, Cypresses, Seminoles, Lidos, Yales and Shinnecocks (until recently) who never seemed interested in holding major tournaments when they surely could have done at some point if they'd wanted to.
"What I'm telling you is the overall quality of architecture was better in the good old days because of Ross, Tillinghast, Raynor, Colt and Park."
While that sentiment may be true in some circles and certainly on this website it's by no means a universal sentiment.