The Mariner of the Seas is a huge ship and an example of the mega cruise ship experience that is the hallmark of Royal Caribbean International. The ship is breathtaking in its size and activities. The Royal Promenade is the main street to this vessel and it is filled with shops, bars, and activities. Yet the whole experience is degraded with the constant attempt to "upsell" the customer into a more expensive product. This "upsell" cast a pall over what, normally, should be a pleasurable experience.
Positives. The Shows. The shows on the ship are exceptional. My wife and I have seen many shows over the years and the shows on the Mariner dazzle the audience. First, they have an ice arena which hosted an ice show. The show, Under the Big Top, was a combination of skating show and circus in a cirque du soleil amalgam. The skaters are top notch and the choreography is amazing. The shows in the main stage area (Savoy Theater) maintain the high standard. Particularly enjoyable was a show based upon popular music of the 80's (yes, including Boy George). The next night saw a tribute band for ABBA. I was skeptical at first but they won me over with their on-target portrayal of this popular group.
The Activities. Their are plenty of activities to choose from.