I’ve never personally worked in the dining halls but I do know quite a few people who have. Generally it’s an easy job to obtain but if you stick with it, there is room for advancement. Tasks can vary from kitchen or dishroom work to serving the food to the public. Some people end up loving it because of the people, others can’t get past the idea of working in food service, so it’s hard to know how it’ll work out for any individual.
I work for another branch of Campus Living Services as a desk receptionist in my dorm complex, so I can definitely remark on the experience of working in the same place you live. It’s extremely convenient to just head downstairs and clock in and it also makes it easier to work in smaller shifts without feeling like you’re wasting your time. Also, working for the university pretty much guarantees you won’t have to worry about shifts conflicting with your classes or breaks.