After playing for about an hour, I can say this game is much more "musical" than part 1. What I mean by that is it's a lot of fun with the freestyle sections where you can switch between tracks, and the freestyle sample sections with preloaded samples that make sense, along with freestyle scratching sections, you actually can put your own "spin" on the song and make it your own.
That, together with the new interface, and even little things like stat tracking items showing up in menus, makes this a worthy upgrade. I'm happy. And I've encountered quite a few "danceable" songs already.