I was really excited when I heard that there was going to be a Just Dance 2 because I was totally addicted to the first one! I've just played it for the first time and was slightly dissappointed. (Although I was playing it alone and it is much more enjoyable when you play with your friends!)
There are more songs, which is a plus and you can download more, although the catalogue is currently quite small. The dance to you sweat mode is also quite good for the health conscious of us. The dance-off songs are quite fun to play with friends too as it makes you more interactive and causes absolute chaos!
I do feel that they changed loads of things unnecessarily. The score bars in the first game are a lot more clearer than the points bubble you get now and you don't have a fun picture anymore! The loading does take a while, which is a little annoying but not unbearable.
Overall, good, but not great. Prefer the first one!