In a way it should be like an interview and in a way it shouldn't. If you sit down and try to interview someone on a date, you are going to make them angry. It should be something more subtle. There should definitely be questions in your mind, but the questions are really more internal rather than external, like, "how did I feel when I met this person," or "how does this person think and is it compatible with me?" The questions that people often ask are more superficial and less effective, like "tell me about you past relationships." The questions have to be deeper, because relationships should be deep. Relationships are the one place where we grow and develop inside. They open us up completely if we'll allow it, so connections could not be superficial. They have to be deep and meaningful.