Keith...
I find questions like this very interesting.
Friar's Head is ranked by Golf Mag as the 32nd best course in the world and the 21st best US course, while Golfweek ranks it as the 9th best modern course in the US and on the composite list I keep as the 25th best course in the US. But Golf Digest doesn't rank it in the Top 100.
Frankly, I track these types of things and see how things change in the future. In this instance, will Golf Digest come around to Golf Mag's and Golfweek's point of view in the future or will one of them start to drop Friar's Head down in the rankings and converge with Golf Digest.
However, combining this thread with Pat Mucci's thread a few days ago might be interesting to dig into as well. What are the different criteria used to judge courses by the different entities. Golf Mag bascially doesn't have any, they just tell their raters to use their gut feel. And their gut says that Friar's Head is one of the best in the world. Golfweek seems to have an emphasis on natural courses, "Walk in the Park" feel, etc. Obviously, along these lines this is one of the best courses in the US. I will need some help on Golf Digest's ranking criteria...but don't they emphasize resistance to scoring and shot values? To those who have played Friar's Head, is it more of a ball-buster in terms of difficulty or is it more of a natural minamlisitic course? If it is one or the other, this might explain the divergence. If not, I don't know why one of the rating entities diverges so much.
I don't know if this helps Keith, but it is my best shot.