Certainly the most challenging....it ought to stop people complaining about how unfairly tough Carnoustie's 18th is the next time the Open visits. Unless they lengthen that to 540 and keep it as a par 4
I think the reason the Road Hole works so well at TOC is that it is the SECOND to last hole. It is brutal, but gives you a chance to redeem yourself. Indeed, a guy tied for the lead in the last group could break a window in the hotel, reload and take a double (which actually would be a pretty clutch 6
) and still have a chance to make it up for it with an eagle on the 18th. Once you lose shots at WS's 18th, they are gone for good.
I'm not saying it should have a driveable par 4 finisher, but if the 18th was the 17th, a medium length par 4 finisher with a wide fairway and tiny green would be a nice respite from the tour standard where you tend to see only stout par 4s and reachable par 5s. You know, holes which are generally half par holes (which we in GCA like) but are only half par holes because of length, not strategy (which we do not like)
My 18th would have a wide fairway, which could have some good parts (nice and flat level lies) and some not so good parts (moundy and uneven, though maybe that area could work to the advantage of an accurate driver like Zach Johnson, if could find a turbo boost hill to bring himself within spitting distance of the big boys) The tiny green would really test the nerve of the pros, and I'm sure there would be plenty of up and down drama like WS's current 18th has despite not being approached from 200+ by everyone.