Celebrity Millennium receives high praise for its exceptional service, friendly staff, and memorable itineraries, especially in Alaska and Asia. Many guests highlight the ship's cleanliness and well-maintained public areas, though some note that the ship is showing its age and could benefit from updates. Food quality is generally good, particularly in the main dining room, but buffet and specialty dining receive mixed reviews. Entertainment and activities are enjoyable for most, though some guests find options limited, especially for younger adults. Excursions and ports are often a highlight, but some guests report issues with organization and communication. Pricing is seen as fair by many, but add-on fees and upselling are a common complaint. Internet connectivity is a weak point, with many guests finding it slow and unreliable. Overall, the Millennium delivers a solid cruise experience with standout service, but there is room for improvement in food variety, entertainment, and ship modernization.