My family loves the Biergarten. The food is good (not great) but we all can find something we like and we love the atmosphere. We have such a fun time! Even my mom who only eats very plain food is able to find several items that she enjoys.
Someone earlier asked about vegetarian options. My sister is a vegan and calls the restaurant a week before her ADR. The chef comes to the table after she's seated, walks her through the buffet showing her the vegan options, plus makes an entree special for her including the tofu she requests when she calls ahead. I'm sure many vegetarians/vegans are afraid to eat there due to the heavy sausage/meats buffet but they really go out of their way to make it a great dining experience for everyone!