My fiance' had a very good experience with the Embassy in Ghana. He was in there for a total of 7 hours, and was asked very basic questions.
Who filed the petition for him?
How we met?
How old I am?
How many times I had visited him?
He had a picture of me from when I was 5 years old I gave him as a joke, and he put it in with his evidence. The consular laughed when he saw it, and said "I am approving your visa! You can pick it up in 2 weeks."
He took a lot of evidence, and the guy didn't look through much just skimmed through it. Overall he had a a very good experience, and said the consular was very nice, and approachable.