Better than Guitar Hero, best music game on PS2
Rock Band has everything that Guitar Hero has. Its just that simple. The guitar has bigger buttons and the buttons down the neck. Its got more well known songs. AND its got multiple instruments. I really didn't need all of the garbage of unlocking some random character to dance behind the notes while I play, so I think that the more simplistic format of the Rock Band backgrounds is in the genre's best interest.
I know there have been all sorts of complaints of people breaking the bass pedal, but no problems yet, and I've played my own as well as three friends of mine.
With the difficulty settings, I've found that anyone from diehard rockers to my mom have been able to find a level of challenge that was doable but fun.
No complaints, but just would have liked to have the world tour feature that the newer systems got, well maybe RB2 will have that in the PS2 this time!
Edit; Guitar Hero World Tour is fully featured, but with the loading time being huge, still completly comparable in quality