In one word: Pretentious!
It could be “the best burger in Curitiba” then it would make more sense. The place is nice, the restaurants are big and comfy, however they serve burgers and that's it.
They could be more creative with ingredients; however calling ordinary bread “crunchy artisanal made bread” is a little too much; the meat is made from meat (thank you!); and the cheddar is top quality, well at least is not rotten to give that bitter kick at the end. It’s pretty much the same “X-Salada” from the Bar do Chicao on the corner but with a fancy name.
Again the burgers are okay; the service is good and atmosphere is excellent, in terms of value for money you can find better places.
I forgot to mention they also serve Fettuccini (?!)