Peter, I was actually thinking about this very topic earlier this week. From an architecture perspective, what is the worst Ross, Flynn, Raynor, etc. course? Assuming we only analyze their courses that have not been significantly altered, I also came to the same conclusion that there aren't any really bad ones.
I wonder if this is because it is pretty easy to replicate once you know how to do it? Basically once you have the skill, it is hard to mess up. If you know how to ride a bike, you almost never mess up. But if you don't know how to ride a bike, it's near impossible.
Or is it that the early architects were able to steer courses to better land or choose better land? This doesn't seem realistic to me because I've seen a few solid Ross courses on flattish land that I enjoyed.
I'm not educated enough to know, but do great artists (painters or sculptors) have works that are generally thought of as bad? I think the answer to this would give us a clue if golf architecture is really any different from expertise in other fields.