Cosmos is widely appreciated for its warm and festive atmosphere, diverse menu, and consistently high-quality food, with many diners highlighting the excellent burgers, General Tao chicken, and delicious desserts. Guests frequently praise the professional and attentive staff, noting that the service often enhances their overall dining experience. While some patrons have expressed concerns regarding pricing, portion sizes, or coffee not being included with breakfast, the restaurant remains a popular destination in Quebec City, especially for its well-regarded promotional offers and welcoming environment for families, groups, and couples alike.