Richmond Hill. Though it may have been the circumstances.
In its early days, it appeared in the Top 10 on this site. Plus, it's a mountain course. Can't miss, right?
Well, about 10 years ago my brother and I daytripped up to Sugaree, with the intent of playing Richmond Hill on the way home. When we finished at Sugaree, our guide offered to get us on another private course nearby, but we declined, and went ahead with our plans.
Well, we got to Richmond Hill, and it was a steady light rain, and there were 4 redundant holes throwing over a valley (level throw, but you have to walk down and up hills to get to your lie), and, well, we quit before we finished. It wasn't bad but, under the circumstances, it was a letdown.
Plus, I'm pretty sure the private course we passed on was Blackjack, which I've never made it to, so I hold Richmond Hill responsible for that, too.