Celebrity Millennium receives high praise for its exceptional service, friendly staff, and memorable itineraries, especially in Alaska and Asia. The food and entertainment are generally well-regarded, though some guests note inconsistencies in buffet quality and specialty dining. The ship is described as clean and well-maintained, but many mention that it is showing its age and could benefit from updates. Cabins are often considered small, and some maintenance issues are reported. Excursions and ports are highlights, though a few guests found descriptions lacking or logistics challenging. Pricing is seen as fair, but add-on fees and upselling are common complaints. Internet connectivity is a weak point, with many citing slow speeds. Overall, the cruise offers great value and memorable experiences, but there is room for improvement in food variety, ship updates, and specialty services.