Went to watch the paraequestrian and was very impressed by the quality of riding but baffled by the quality of judging. Not saying this as sour grapes – though I was disappointed our Americans didn’t get better scores on some of the very good rides they put in – but of the five judges, there would regularly be final scores ranging by 7-10 points, sometimes even more! There were no test rides, as far as I’m aware, to help the judges make sure they were on the same page, and it seemed the riders (of all countries) paid the price.
Dressage will always be subjective, but I can’t imagine how frustrating it must be to put in those years of work only to have one judge give you a 6, another give you a 7, and a third give you a ZERO … all on the same thing! 
On the plus side, the Americans put in some solid performances that looked like good building blocks for the future. This was the first international competition for many of them; they’ve gotten some valuable mileage for the future. Onward and upward!