Tempura Tendon Tenya in Singapore receives mostly positive reviews for its authentic Japanese flavors, crispy tempura, and reasonable prices. Customers appreciate friendly service, clean environment, and efficient ordering systems. However, consistent complaints include long wait times, slow service during peak hours, limited seating arrangements, and concerns over the recent introduction of service charges despite the self-service model. Some note that food quality varies between outlets, and portions may sometimes be small or inconsistent. Overall, it remains a popular choice for casual Japanese comfort food, with ongoing efforts needed to improve service speed and seating management.