Celebrity Constellation receives high marks for its attentive and friendly staff, diverse itineraries, and overall cruise experience. Many guests praise the service, cleanliness, and entertainment, but there are recurring criticisms regarding food quality and variety, aging ship facilities, and occasional crowding. While most reviews are positive, some guests note that the ship is showing its age and that certain aspects, such as dining and excursions, could be improved. Overall, the cruise offers good value and memorable experiences, especially for those prioritizing service and destinations.