Celebrity Constellation receives high marks for its friendly and attentive staff, diverse itineraries, and generally enjoyable cruise experiences. Many guests praise the service, cleanliness, and entertainment, though there are recurring criticisms about food quality and variety, aging ship facilities, and occasional issues with crowding and value for money. Specialty dining and excursions receive mixed reviews, and some guests note that the ship is showing its age. Overall, the cruise is recommended for its service and destinations, but improvements are needed in dining, ship maintenance, and value-added services.