I get my visa to Australia overnight and I love Australia. I also get my visa to the USA via drop box in 5 working days good for 10 years! What has Australia done to you to say that? Don’t be mean.
US embassy will not tell you the reason for refusing you a Visa. You file your application online, get an appointment and go for your interview. When they pull up your application they already know if you will be refused or given a Visa.