5 guys became famous because Obama likes getting takeout from there. I got my first taste 2 weeks ago in BC. I found the menu disappointingly limited. Just burgers and fries. No onion rings, no gravy, no milkshakes. All burgers are double patties, although small patties. They weren't particularly flavourful and a bit dry. The only plus I found were toppings that normally would be extra at other places were included (grilled mushrooms, grilled onions).
If you go to Buffalo, Fuddruckers is a much more amazing burger. I find even South St a better burger than 5 guys.