Restaurant HOIAN BBQ is widely praised for its authentic and varied Vietnamese cuisine, particularly its buffet and barbecue offerings, which many guests find delicious and generous. The restaurant is appreciated for its pleasant lakeside location at Port d'Ouchy in Lausanne, featuring a spacious terrace with a beautiful view of the lake and marina. The staff is frequently described as friendly, attentive, and professional, contributing positively to the dining experience. However, some reviews mention inconsistent service quality, including slow service, occasional communication difficulties, and less attentive moments after order placement. A few customers have reported issues with hospitality, including an incident involving the treatment of guests with dogs. Additionally, some diners feel that certain dishes, such as the grill accompaniments, are served in insufficient quantities relative to the price. The atmosphere is considered lively and enjoyable, though sometimes noisy, especially during busy times or events. Overall, HOIAN BBQ is recommended for those seeking authentic Vietnamese food in a charming setting, with the caveat of occasional service and hospitality concerns.