Perfectly normal, I didnt feel hungry either until about 2-3 weeks out (I was on liquids a month).
I wouldnt worry about your vitamin and nutrient intake and such, you are taking your vitamins, drinking your shakes. It is ohhh so important to follow your post op diet. You have probably read it a million times but your tummy needs to heal. You dont want to possibly damage your band, or start off with poor eating habits right from the get-go. I know it is only a bit of mashed potato and gravy, but eventually your appetite will come back, and you will start eating more and more of these kinds of things which will only set you up for dissapointment. Also, if you are not really hungry.... why eat? As you mentioned you are getting your requirements.