Celebrity Constellation receives high marks for its friendly and attentive staff, diverse itineraries, and generally enjoyable cruise experience. Many guests praise the service, cleanliness, and entertainment, but 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, with some guests feeling the extra costs are not justified. Overall, the ship offers a classic cruise experience with standout service, but could benefit from updates and improvements in dining and amenities.