The songs selection is sad and moves of the avatars are old school for some of the songs. It's not worth RENTING let alone own. My kids tried it once then, package it up and gave it back to me. They said "mail it out please". We do not like it.
Just Dance is a very fun series, and I enjoy each one. After having the first two on the wii, I wanted to try the Kinect version. After playing it I was very impressed of how well it responded. Now of course the Kinect version of Just Dance 3 will be overshadowed by Dance Central (which is also a very good dance series on the Kinect) but Just Dance 3 still has it's own fun. Like Dance Central it's very responsive, something that a lot of Kinect games aren't. I would give it a try, if you like Dance Central you'll like this.