On first glance, Burger Inn doesn't appear to be vegetarian-friendly with its proudly advertised "exotic" meats. However, I assure you that it is. In fact, their veggie burger (the "Harvest" burger on their menu) is actually one of the best meatless patties I have ever had. It is completely soy-free which is awesome for people with intolerances. The bulk is made of grains and mushrooms but you really can't tell. It really tastes like a classic fast-food burger.
Definitely make sure you order the fries when you go here. They're fantastic. I'm a sucker for home-style potato fries that still have the skins left on. Yum! The portions are pretty big so if you aren't a huge eater, the regular-size should be enough to share between two people.
Also as others have mentioned, yes the décor is outdated but I honestly think it adds to the charm of the Burger Inn. It isn't about flash; it's about serving delicious comfort food.