Regent Seven Seas Mariner receives high praise for its attentive service, luxurious accommodations, and overall cruise experience. Most guests highlight the professionalism and friendliness of the staff, the quality of the food, and the comfort of the cabins. Entertainment and activities are generally well-received, though some guests found them lacking compared to other luxury lines. The ship is noted for its cleanliness, though a few reviews mention it is showing signs of age. Excursions and shore experiences are a mixed bag, with some guests delighted and others disappointed by organization and accessibility. Pricing is considered high but often justified by the all-inclusive nature and overall value. Internet connectivity is a common complaint, with many expecting better WiFi for the price. Overall, the Mariner offers a luxury cruise experience that meets or exceeds expectations for most guests, with a few areas for improvement.