As a European living in Australia, I had not been exposed to many US circuits before. The ones I was familiar with would be Daytona, Indianapolis and the old Phoenix circuit and the new Austin circuit from F1. But wow, I have been blown away by the US circuits I have in Assetto Corsa. Road Atlanta is an amazing track, So fast and sweeping, every turn is a joy. There is so little to fault, it is so challenging and enjoyable. Mid Ohio was another surprise. Shockingly fast and tricky, but again not one poor corner, just sheer class, I could go on....Road America, Virginia, Watkins Glen, Sonoma.....these tracks are so much better than the current F1 calendar. So much better. I would say only Spa, Suzuka and Monaco are in the same league as the circuits I've mentioned.