I have sat on our local MOCs board the last few years. I sat on another MOCs board a handful of times in another state previously. I interviewed candidates two weekends ago. We had 15 USNA candidates. We had a panel of 5 for our interviews. Sorry if your experience was lackluster. To be honest, your interview type and questions do not sound that foreign to me.
I can't speak for each panel across the country. Prior to the interview I get a large binder with your essay, LORs, resume, transcript and scores. I read each one very carefully and take tons of notes. From reading each packet I am able to develop questions about your academics, leadership, etc. When I ask certain questions it is giving me two things... one an answer to something that is standing out, a gap, or something I want clarification on while evaluating your presence, communication and confidence. We also ask questions like why USNA, what do you want to major in, what service selection interests you to gauge your interest, your "why", and what research you have done. If you have nearly zero athletics on your resume I am going to ask your CFA scores. With it being late Nov/early Dec if I hear you have not scheduled it yet I am questioning things. If I ask why a Naval Officer and I hear all about USNA and then ask what your plan B is and it does not include NROTC or an OCS discussion, then I question things even more. I don't expect a 17/18 year old to know what they want to do until they retire. I expect them to understand USNA specifically has limited majors, is STEM focused and that just because they major in engineering doesn't mean they are going to design ships as an Ensign. USNA is there produce Unrestricted Line Officers. Honestly I can formulate an opinion within about 2-3 minutes of a candidate talking. Each interview on every panel I have sat on has been 15-20 minutes max. I take a great deal of time to review each packet and discuss that with the panel. Trust me when I say every panel member I have encountered takes their job very seriously and wants to provide a nom to the best candidates. The most recent panel I sat on, we were all grads. We take who joins our institution very seriously!
If a board member said you are "pretty much getting a nom" it means they probably don't have more than 10 or so candidates in that area or your paper really stands out amongst others. I interviewed 15 candidates this year. Only 2 really stood between paper and the interview. Another 2 were borderline... I really liked their resumes and interviews, but they have some academic stats that were very borderline and honestly a prep year would do them wonders. The year before we had around 20 candidates and 12 very qualified. Year to year varies and every district is different.