Review
This game is a sequel to "iDOLM@STER" for the 360. The way the game plays is fairly simple, like Taiko no Tatsujin is played. Although it plays like Taiko, it has stricter timing. This game is fanservice for the people who enjoyed the first game. It's also very easy to set up characters and have them play whatever song you like. As for the language barrier, there isn't a great amount of Japanese text to be found.
Overall, the entirety of the game can be played without the knowledge of Japanese. It is far easier to comprehend than what the original title was (for non-Japanese), but it doesn't have as much depth as the original game, either.
The achievements in this game are also very easy. It might take you around 4 hours at maximum to get all of them.
I think it's an enjoyable game to play. They keep releasing updates with downloadable content (sometimes free items with catalogs) because it is highly popular. Along with this, they also include gifts which come with some costumes (usually, they are 500 ms points + free gift), and usually the free gifts are a 3-4 item set from the original game.
Unfortunately, accessories cannot be transferred from the original game to this title, and so forth.
日版 
