Good for what it is.
I had to pick this up as a Rock Band fan, and it does not disappoint. As a portable edition with no specialized controllers, this still manages to convey the core Rock Band gameplay experience, which is very surprising. My only gripes are the short playlist of 41 songs and the inexplicable timing of its save-data routines. People have pointed out that it should support interoperable DLC with the Playstation 3 version, but honestly with the difference in data structures that would be untenable.

5 Stars
I've never been too fond of music games, plastic guitars dont hold any appeal to me, but this game is better suited to my play style.
Lots of really good songs(like Ace of Spades or ABC),great graphics and the use of everything that makes Rock Band great(minus the nasty plastic instruments)make this one a winner.
And dont forget the headphones.

Portable Fun
Music entertainment on the go. Rhythm, timing, and some headphones and your in the band. Creative play without the use of a peripheral (guitar etc) I'm enjoying the add-on content as well as the pre-installed games.

Awosome handheld music game
This game features a really complete package of music, including songs from a wide selection of artists, so you you will probably find your favorites songs here.
create your band and rock in different locations to earn money and customize your band!!!!
If you like music and rhythm games in general you can't go wrong whit this game!!