I got this the other day.. Obsessed!!! Half way through medium at the moment and can't get past the Slash battle on medium GRRR!!
Ahhhh yeah, Slash is a ****! I've just beaten Tom Morello on Career mode Hard. I'm currently on Hard and some Expert songs apart from Dragonforce (obviously), which I'm still having to play on easy just to do it justice. I can do it on medium, but it's just not perfect yet. Also have to recommend "Rock the 80s". Brilliant addition to the game and once you've played 2 player you'll never want to play solo again!