Celebrity Millennium receives high marks for its exceptional service, beautiful itineraries, and memorable experiences, especially in Alaska and Asia. The staff is frequently praised for their friendliness and professionalism, and many guests highlight the ship's cleanliness and well-maintained public areas. However, some reviews note that the ship is showing its age, with occasional maintenance issues and outdated cabins. Food quality is generally good in the main dining rooms, but buffet and specialty dining receive mixed feedback. Entertainment and activities are enjoyable but can be limited, especially for younger adults. Pricing and value are considered fair, though some guests are frustrated by add-on fees and upselling. Excursions are well-organized but sometimes lack detailed descriptions. Internet connectivity is a common complaint, with slow speeds and unreliable service. Overall, the Celebrity Millennium offers a solid cruise experience with standout service, but could benefit from updates and improvements in certain areas.