Borrowed Guitar Hero: Metallica from a friend. However, I have a Rock Band drum kit, so how the bejeezus are you supposed to activate star power?
Anyway, just from the few songs I've tried, it seems that medium difficulty on GH:M is roughly equal to easy on on Rock Band 2. Of course, I've only played a few songs, and it's probably that those were the ones that were fairly easy on drums. (For instance, I have not tried Battery or Fuel, much less Master of Puppets.)
Still, fun game.
Anyway, just from the few songs I've tried, it seems that medium difficulty on GH:M is roughly equal to easy on on Rock Band 2. Of course, I've only played a few songs, and it's probably that those were the ones that were fairly easy on drums. (For instance, I have not tried Battery or Fuel, much less Master of Puppets.)
Still, fun game.