That subway life, I feeeel you. I worked there for a year when I was 18. Our store had relatively fresh veggies but the meat is so processed and bread comes frozen. I won't generalise but most people in those jobs have very little care and that definitely comes out in the service that is provided.
"Fast food" is usually fake food in my eyes. I also worked at KFC when I was even younger and don't even get me started on the shit that happens at dirty bird.