Mercato Mayfair is worth it for the spectacular church setting and broad food-hall energy, but the food quality and seating chaos are uneven enough that you should treat it as an experience-first stop, not a guaranteed great meal.
Mercato Mayfair trades culinary consistency for architectural drama—the converted church setting with rooftop terrace is genuinely exceptional and justifies the visit for many. However, uneven food quality across stalls, hygiene concerns in multiple reports, and crowding and accessibility issues prevent a higher grade. Best approached as an Instagram-worthy social venue where the building matters more than the kitchen.
One caveat: Food quality is inconsistent between stalls, so one excellent plate does not guarantee the next one lands the same way.