Harmony of the Seas receives high praise for its impressive ship design, wide range of activities, and exceptional service from staff. Most guests enjoyed the food, entertainment, and family-friendly atmosphere. However, some reviews mention issues with overcrowding, elevator wait times, inconsistent food quality in the main dining room, and extra charges for certain amenities. Specialty services and excursions received mixed feedback, with some guests disappointed by additional fees and underwhelming experiences. Overall, the cruise is highly recommended for families and those seeking a lively, activity-filled vacation, though some may find the crowds and costs challenging.