My family group of 4 (2 cabins, two teenagers) had a great time. The food was delicious, the staff and entertainment was terrific. Our cabin steward was great and we nominated him for the "Vacation Hero" award. This gives them special events to attend as well as a favorable mark in their HR record so they get preference for new positions when they become available.
Make sure to put your name in to have dinner with the ship's officers - we enjoyed a wonderful dinner (including dining from the ala carte menu and free bar services!) with the Asst. Hotel Director and the Guest Services Manager. Lots of cool information and great company. They even gave us the picture of the group that they took!
A couple of negatives (and neither are specific to the Jade):