Honestly sometimes it's good to get an interview date. It doesn't necessarily mean that they will interview you. Others have gone thinking it's a interview and they get there they were asked 1 question then they got there passport on the spot instead of having to mail it in. Sometimes when you have to mail it in it could take up to a month or longer to receive it back. So interview has it's good and bads. Also people who had to be interviewed it's because they might have concerns about you relationship they may think it's not authentic