Ryan and others,
I've seen a few comments along the lines of "I'm surprised such-and-such course is rated so low. In general, my first reaction is "How would you know? How many of these have you played?"
I counted, and I've played 18 of these courses. I have no idea where Butler National belongs, but I have at least of understanding where Hidden Creek deserves to be. Also, remember, as Tom D. says, that newer courses tend to start high and drift down. For Butler National, an older, well established course to sit at #74 is quite an accomplishment.
I love the modern 100 list.