Celebrity Constellation receives high marks for its attentive and friendly service, well-organized itineraries, and overall enjoyable cruise experience. Many guests praise the staff and crew, the cleanliness of the ship, and the variety of destinations. However, there are recurring criticisms regarding the quality and variety of food in the main dining rooms, the aging condition of the ship, and occasional issues with entertainment and excursions. Pricing and extra charges for amenities like Wi-Fi and drinks are also noted as drawbacks. Overall, the ship offers a classic cruise experience with standout service, but some areas could benefit from updates and improvements.