I picked up the demo on the XBL Marketplace expecting a crappy game, boy was I wrong, instead I found a good party game.
I'm going off, so let me just explain. This game is fun if you want to play along with your favorite songs and don't really want to play 'the real thing'.
The game features classic songs like 'Paint It Black' and 'Talk Dirty To Me' as well as newer songs like 'My Curse' and 'Lay Down'. Band selection is wide, genre selection is wide, you''l find at least one song you like. It features classic Guitar Hero gameplay in the note scrolling fashion. The battles you encounter (Tom Morello of Audioslave/Rage Against The Machine, Slash of Guns And Roses/Velvet Revolver, and the effing Devil.) are neat at first but then become hard when you notice that they don't miss a note on Expert, forcing you to act as a power up beast, using them at key parts of the battle to cripple your opponent.
And another thing is that the 'Legends' of rock should really be 'Legend', considering everyone's heard of Slash and almost no one knows who Tom Morello is (I like RATM and Audioslave, I know who he is). And where are the other guitar gods? Jimi Hendrix, Steve Vai, Joe Satriani, Jimmy Page, Kurt Cobain, hell, anyone else? No, just two (three if the devil counts)
My only real problem is that when you advance from Easy to Medium to Hard, you will go with ease until the last two or three venues of the career on Hard and then get kicked in the balls by tough hammer-on/pull-off sequences and three fret chords. You'll need practice to get good enough to actually get far into the game (if you play on Expert, I hate you). I've yet to beat the game on Hard because three songs are killing me on Hard (Slipknot, Muse, and some other song)
Someone may tell you to play a real guitar instead. Yes, you should try if you're good at Guitar Hero, but don't think you have to, it's just a suggestion. If I enjoy Call Of Duty, are you going to tell me to join the army? No, so I don't understand why people say you have to play a real guitar after playing this. People talk down to Guitar Hero like it's actually making CDs stop selling and stopping guitars from being played, when actually it's helped sell tons of CDs and made bands really famous (I'm looking at you Dragonforce.)
It's fun, and it should amuse you at least until you hit your guitar limit in this game. Then you can either practice until you get better or quit. This game has a fault or two but should be a purchase at some point (unless you are one of those 'real guitar players', and in that case, play to some one who cares.)