First, here's a list of what we enjoyed: the public areas of the ship were very nice and taken care of quite well; the selection and quality of the casual dining options (buffet including pasta and sushi stations; pool grill) were very good; the bar in the Aft of the ship was a very relaxing place to hang out (and the drinks tended to be more potent there!); the service provided by the staff/crew was by and large excellent as most of them really tried to make a positive impact; the specialty dining restaurant (Murano) was superb and as high quality as just about any restaurant at which my wife and I have dined; and we found fun and relaxing activities at both of the ports of call (Key West and Cozumel).
Here's what did not work for us: the Concierge Class stateroom that we stayed in showed significant wear and tear including worn carpeting and rust in the shower; the cleaning of our stateroom was mediocre at best (used tissues left in one of the bathroom cabinets from a previous traveler; a pair of women's underwear left in one of the closet drawers); the types of people on the ship was not what we expected as we anticipated a classier group (this may have been a reflection of the cruise being for a short period of time over a weekend); there generally was too much of a summer camp, party hardy, gluttonous atmosphere including one day in which very loud, hip hop music was being played at the pool; the pools on the Century are much too small; the entertainment (i.e., shows) was of average quality at best even though we enjoyed spending time in the theater itself; we found the food in the MDR to be of about the same quality as a Denny's, and in fact enjoyed dinner more at the casual dining options; and room service for breakfast just didn't seem to work well as they made errors with our order twice.
In the end, my wife and I did have an enjoyable, fairly relaxing get away. What we would have preferred is a bit more laid back, upscale experience with even more of an opportunity to relax into our time at sea (and port).