They have an awesome counter, which is really fun because you meet people and share your finds on the menu. Check out their oyster selection, great grilled cheese sandwiches, and my new favorite, the lobster roll. Their clams and chorizo are killer as well.
Be careful not to eat to much if you are going to Arc. While this is a oyster paradise, Arc is a meat lovers dream. Both are excellent and I highly recommend going to both.