Reviews indicate that Five Guys in Singapore offers large, customizable burgers with fresh ingredients and generous servings of fries and milkshakes, reminiscent of the American experience. However, common criticisms include high prices, inconsistent food quality, overly salty fries, and long wait times. Customer service experiences vary, with many praising staff like Jennifer for their friendliness, while others report rude behavior. The overall impression is that while the food is tasty and satisfying, the cost and service issues often detract from the experience.