great discussion. i look forward to the day(s) that i get to play flyboy and other courses that have been mentioned here.
imho disc golf courses that merit a 5 rating yet to exist. the major thing holding most 4.5 rated courses back from the elusive 5 is the lack of dynamic greens. baskets on flat, open ground lack an important aspect of risk/reward. most disc golfers are familiar with those terms as they apply to full shots, but our game has a big hurdle to overcome in bringing the potential for three-putting into the forefront.
chuck and others have suggested smaller and/or uni-directional type specialty targets. i do see the usefulness of these types of experiments for demonstrating concepts, but love our baskets (as long as their catching consistency can be improved - another topic altogether).
i see the great need for moving dirt on "the greens" to create situations that cause players to really think on their throws to the green about where to place the disc that will balance the risks of bogeys with the rewards of birdies according to their particular tolerance for risk, wind conditions, standing in a competitive round, etc. there are tons of opportunities to creatively express additional challenge around the basket. this is the real opportunity for our course designs to improve markedly.
one additional point: most of the reviewers on this site (myself included) are biased towards over-rating courses. assuming that the entire set of disc golf courses are normally distributed according to quality, and given a scoring range of 0 to 5, the mean score should be (5+0)/2 = 2.5. i believe that many would look at the ratings and assume that 3 should be the mean score. this would be true if the rating system was from 1 to 5, (5+1)/2 = 3.
the data that fed this image was from 10 trusted reviewers, each with a minimum of 30 reviews.