Graphics are never the focal point of a music game. As long as the game properly communicates the required inputs to the player in a clean, efficient manner, there shouldn't be much to complain about. DJ Hero 2 features a virtually identical presentation to the one in the original DJ Hero, and that's perfectly fine. High-definition it isn't, but it comes with the territory. The new input styles make sense from an aesthetic standpoint; for example, when you see a freestyle crossfade section, tiny but distinct lines mark the segments that are rich in musical potential. This helps you learn the songs more quickly.
I won't lie. When I started up the Wii version of DJ Hero 2, I was left with the worst possible first impression I've ever gotten from a game. Not one second after the title screen popped up, I was greeted with an obnoxious "YOOOOOOOOOUUUUUUUU!" That's not fair, I know; just because I break out in hives upon hearing the voice of Soulja Boy Tell 'Em doesn't mean that everybody does. DJ Hero 2's soundtrack is superb. I'm not saying that because I'm a huge fan of the selected tracks. What I really respect about DJ Hero 2's soundtrack is how the components of each mix feel like they were designed to work in harmony. Regardless of your musical tastes, the soundtrack is mastered so well you're almost guaranteed to fall into a zen-like trance every time you start scratching.