The first officer who reviewed the docs before the interview asked me for my fiance's tax returns. I didn't have them since it wasn't in the official list of items. I instead had his 401k and employment details. She scoffed at me, "does he not pay taxes?" There was no need to be snappy so I just maintained composure and controlled myself from talking back.
The Consul who actually did the interview was kind.
She asked standard questions like how we met, the last time we met and about when I last visited my US citizen fiance in the USA.
She seemed easily convinced by the authenticity of our relationship.
She closed the interview by giving me a pamphlet with info in case of domestic violence.
Total time from queueing to interview was about 3 hours. The interview itself took about 15 mins.