Not bad, not good. Sometimes forgettable.
Storyline: There isn't much of a storyline, so I can't say a lot.
Gameplay: All you do is dance. You choose to dance one 4 difficulties(5 in all). Beginner, Basic, Difficult, and Expert. Challenger is only used on certain songs, mainly high speed ones. The gameplay is somewhat repetitive and not very versatile.
Music/Songs: The music has a lot of variety, which I love. Some songs are in Japanese, so unless you took a Japanese class, you probably won't understand a word. Also, there may or may not be a song that you've never heard of.
Difficulty: The difficulty is straightfoward, as simple as that.
Graphics: The graphics are okay. Most of the graphics are anime, like a cartoon.
Overall; I didn't think DDR was bad. It's not up to me whether or not to purchase it. DDR SuperNova 2 may or may not be available. I think the game had room for improvement.