Worst Major Championship Venues

Valhalla Golf Club -- Louisville, Ky.
Sure we remember the 2008 Ryder Cup, with Boo Weekley horsing around and the 2000 PGA Championship, where Tiger Woods outdueled Bob May, but what else jumps out, other than the attractive, if goofy, stacked rock 13th green? Jack Nicklaus crafted all kinds of strategic options into the layout, but none of it looks natural.