Roughly 6 years ago, my Thai wife went to the USA on a tourist visa. For the interview she brought all the forms, birth certificates, paperwork, chanote, bank books, etc. The interviewer spoke fluent Thai, asked her a few questions and looked at just a few papers for a few minutes and was approved, no hassle.
I think some of decision making goes down to how credible the marriage is, in our case we were already married for 10 years and have a son together.
If your marriage is new, maybe they will "dig" a little more.