I have reviewed 11 9 holers in GA, SC, NC, FL and have 2-.5s, 1-2, 3-2.5s, 4-3s, 1-3.5
I have never rated an 18 that low, the lowest was 1.5 and it would probably be .5 or less now because it has been abandoned.
Here is the reason I think you find more utter crap 9 holers, much for the reasons above with who and where they are put in...also who designs them? *for the most part* it is an unexperienced land owner or parks person and they may or may not have a solid grasp of what it takes.
The 3.5, River City Nature Park, was done by a professional design group and featured 2 teepads, both concrete, signs, multiple pin positions, an ace board, bulletin board, and free bugspray...how can you go wrong there? Its issue...some high grass, and not a huge amount of variety given the flat land...but they did the best with what they had.
Could there be a 5 star 9 holer? Yeah I think so, it would take a prime piece of land, full amenities, and maybe even some above and beyond stuff. I think the prime piece of land is the problem...how many 7-10 acre lots feature every terrain type and are located amongst other land that is at your disposal?