The unplayable courses thread got me thinking...
(and this often leads to trouble in and of itself)
But...
Given your individual game, what is the greatest challenge for you on a golf course - the one feature that a course could have that round after round, course after course, if it appears, you are in trouble.
For instance, if you hit the ball accurately, but low with little spin, then perhaps elevated, firm greens are the best way to defend par against your game...and an extreme appearance of this trait might be deemed unplayable by you.
If unplayable is a relative term, and I certainly think it is, then this should have a different answer for everyone. Pine Valley might be "unplayable" to the high handicapper, but what about the low handicapper who sprays it and recovers...suddenly a course that places a premium on driving the ball might be unplayable for this LOW handicapper.
Me? Tight hole corridors usually ruin me. I hit the ball a long way, and I hit it high. Distance never bothers me. Forced carries never bother me. But you carve a course out of a forest with relatively narrow corridors and no parallel fairways, I'm in for a long day unless I have the tee game dialed in (more rare than not).
Give me a 7900 yard course with ravines fronting greens, 260 yard forced carries, and rock hard elevated greens with OB long on every hole, and I will be less apt to argue "unplayable" than I would on a 6500 yard course in northern Maine where the trees creep right to the edges of the fairways, and the underbrush in the forest prevents you from finding your ball.
I played with a guy in college who would probably shoot around even on such a course every single time...I'd be lucky to be under 85...but on the 7900 yard course, he'd be playing to a par of 80 and probably cursing the architect when he can't reach the fairway.