Well, Dance Dance Revolution is my all-time favorite (I have most of the US PS2 games), but I also enjoy Guitar Hero/Rock Band, the Project DIVA games, and Don't Tap the White Tile, if you count it as a rhythm game. And more recently, CROSS×BEATS on the iPad.
hmm , maimai orange plus ? yea its very very old machine my region doesnt upgrade it to newest maimai version lol, and VOEZ i think it lil bit awsome , i really like the gameplay