I've only played 4 or 5 on the world list.
I played Merion for the first time last year. I loved it immediately, though I feel it's greatest weakness is using long rough to defend par.
I played Winged Foot (West) for the first time last year. I thought it was overrated, mostly because of the flat terrain and the repetitive push up greens. Also, I was never fooled on the greens, reading every putt approximately right. I thought the back nine was very good, with more variety and ground movement. How it ranks above Pacific Dunes and Crystal Downs baffles me, though its straightforward difficulty counts for something. Does its history and championship pedigree count too?
My home course, Pumpkin Ridge, is quite similar to Winged Foot, with two relatively equal, championship worthy courses. Over the past few years, we have hosted a few Winged Foot groups, who generally finish their rounds very impressed with the course(s). I believe our club is every bit as good as theirs, especially for women and higher handicap players. However, for the good to great player, Pumpkin's green complexes aren't severe enough and the fairways are too flat. I wish it had been built a little wilder. Overall, it's a great members club.
I also played Plainfield on the same trip and liked it better than Winged Foot.
I just know somebody is going to call me on these remarks, based on one round.