What is the wii game "Just Dance 2" like? (please answer)?

So I'm interested in getting the Just Dance 2 wii game, but I'm not sure what it'll be like. Is it fun?.. Is it similar to Dance Dance Revolution?.. Do I need the DDR matt for the game to work?.. Do I need anything other than the wii itself (which I already own), but what is the game like?.. Is it fun?.. I'm really interested in the game and I'm a teenager, but I don't know if it'll be worth it. Is it worth it?.. Whats your opinion on the game?.. SERIOUS ANSWERS ONLY PLEASE :) Thanks :)