The 6th at Valhalla is no great hole, but I really do wonder what we would say if one of GCA's favorite architects had built it (assuming they would have built a hole that played exactly the same but with more naturalistic shaping). The tee shot really gives an advantage to a player who hugs the Fork off the tee, as doing so can be the difference between a 5 iron and a 3 wood approach. The Fork also functions a bit like a Hell's Half Acre hazard in the sense that it's easily cleared after a good tee shot, but adds some stakes to the second shot if your drive goes offline. It works as a governor for strong players so they can't just turn another 500 yard par 4 into a driver-8 iron while a weak player from the correct set of tees can still hit a full drive and set up a fairly simple layup, or swing for the fences on their approach if they successfully challenge the hazard edge.
Like most of Valhalla, the shaping is pure '80s and completely incongruous with what is really an outstanding setting. It takes a phenomenal piece of land and makes it borderline ugly. That being said, I really like the way the hole plays and I must say that I enjoy seeing pros hitting approaches to a par 4 with 3 woods. My verdict: breath of fresh air.