Wow.. this sounds really like a disaster stay and for that price tag. I would really launch a complain towards the hotel management/Marriott. Having been so many times to Japan, i have found that not everything works as clockwork and sometimes it can be really bad like what you experience. I am quite sure it is as you mentioned not due to cultural difference but just generation gap difference. The meal presentation has got to be indeed worst I've ever observed for this level of hotel.
Feel bad for you to have experienced this.