How do we measure the "fierceness" of a bunker? Is it just depth and size? I'm sure that there are many bunkers that are not terribly imposing on their own, but the length of the shot one must play out of them adds to the difficulty. I could be wrong, but it seems that a majority of the bunkers discussed in this thread are greenside--that is, no more than 30 yard away from any pin. Couldn't a worthy candidate be a bunker which leaves the player with 40-70 yards to the hole? I haven't played the courses being discussed in this thread, but one bunker that comes to mind is on the 11th at Pawleys Plantation. Seeing as it encompasses four oak trees and lies about 100 yards from the middle of the green, one must play a chip shot with an 8 iron or so to a green running away. It's a flat bunker, but the rest of the shot dictates its fierceness.
If memory serves, theres a bunker to the right of the 5th green at Tot Hill Farm which is comparable to the DA in size (but not depth), but is occupied by a large boulder in the right half of it.
Does not the difficulty of these bunkers change with changing hole locations? I'll say for high certainty that changes in pin placement do not affect the difficulty of the right bunker at Yale #8.