Just Dance 2014 isn't a must have next-gen (current gen?) experience. In fact, it's available on five consoles, so this is simply Ubisoft's way of bringing it to an even bigger audience, rather than a utilization of the PS4′s power and capabilities.
A track list that will get you moving; PlayStation 4 Camera tracking is decent; Tons of unlockables and alternate choreographies; The World Dance Floor and Sweat modes; Just Dance TV highlights
Yes; you actually have to get up and put down the controller; Might be slightly embarrassing (get over it); Move controller on its own is imprecise and distracting; A fair amount of space needed for good tracking.