Not much is open in Bar Harbor in the winter season. The Thirsty Whale is a warm spot in the middle of a cold abandoned town.
The cons: the menu is limited and the staff aren't going to be your lifelong besties. In fast, they won't ask how you are, wont chit chat, and frankly don't care.
The limited menu is excellent. Over several visits, everything was good. The staff notice if your drink is empty. They bring you another. They anticipate your needs. This ain't Cheers, but if you want to read a book or check your phone, this is the place.