Wayne: I think the first hole is important in establishing the character of a course, but I would be surprised if anyone really thinks the first green should be the hardest green on the course.
As severe as the first green at Crystal Downs is, it is only perhaps the fourth or fifth most severe green on the course, behind nos. 9, 10, 11 and 13. But the first green does tell you right away that you had better pay attention to which side of the hole you miss on.
Likewise, the first green at National tells you that the course is not the hardest you are ever going to play, but that you have not seen anything like it before. The first greens at Winged Foot West and at Oakmont both emphasize the nature of the course. And the first green at Pine Valley tells you that the course is one tough s.o.b. (I will never forget my host, who is a seriously good player, missing the first green to the right and walking off with an 8.)
Jordan: I personally am not that big a fan of the first green at Friars Head. It's severe, but sort of awkward, especially since you can't really judge what you are doing from down in the fairway. I think there are lots of better greens there, especially the ninth, which is tremendously severe but all right in front of you.