What's great about JD3 is that they just took JD2 and improved on it. It wasn't a total overhaul, it was just some extra features. As you play, you gain 'Mojo', which in turn unlocks new songs and dance modes. I like games where you have something to work towards. JD2 didn't have that. The song list is fantastic, with a wide variety of speeds and styles. It also has some songs with 4 different dancers, to make things more interesting when playing with friends. My favorite song so far is 'Beautiful Liar', which was originally performed by Shakira and Beyonce. Of course it was a fun, booty-shaking good time :) And you know that song by Cee-Lo, called Forget You? It's on here too. Oh, and I was sweating like crazy after just a few songs - but it was fine with me because I was having so much fun! I can't wait to unlock some more fun songs!
And here's some Cee-Lo, just for the heck of it :P (This is the un-edited version, so be forewarned)
Disclaimer: I am not being paid for this review. This post is solely my opinion.