I would consider this game good, unless you have Guitar Hero World Tour. Most of the songs on this game were put on to GH:WT.
Disregarding that, it is a fun game, like the original, some good songs. Although I have not made use of it yet, I would like to try the local wireless function that allows songs to be played on both games (this and the original GH:OT).
If a third one is ever made (highly doubtful with the upcoming DSi not having a gameboy slot), I would like to see some wi-fi connectivity, and most of the songs that are in the game exclusive.
