Tom:
I agree with your assumptions. In fact, if a magazine wanted their ratings to be more accurate, they would require that their raters have played a certain percentage of the top 300 courses before even counting their votes. That is why I value the opinions of those on this string that have seen many courses - they just have a better perspective.
Question - Are there some courses that, while never seen in person, can be judged from repeated exposure on television and other materials? I realize it may not be fair, but do you think you need to walk the grounds of a course before you judge it? For instance, almost everyone on this board has seen Medinah #3 so many times on television and through pictures and videos. If I had never played it, I think I could have told someone that I liked Bandon Trails over it.