The Legends Of Rock in Guitar Hero 3 isn't there for nothing.
The game is composed of a new guitar controller that is better than the previously and of two new modes. For example a battle mode and online mode (Playstation version, because there was one in Guitar Hero 2 for the XBOX 360).
Lets begin with the story mode. For the first time, there is cutscenes in it, that made you follow the band that your guitar player is in. The is in the around of 50 songs to play and 3 guitar battle. There is Tom Morello, Slash and Lou. Like in the other ones, you can buy new guitars, songs, characters
and more. But now you can buy dressing styles for the playing characters. And the most important thing I think to tell about the story mode (it concerns the other modes too), you remember in the other Guitar Hero that you could have a stars note for your performance, now its not with the more points, now it's with the most you have notes in a strike. That's a bad thing I think for this game.
The multiplayer/ online mode is quite really fun. Maybe more in Online, because personally I don't know persons that have the game and no you'll not have the same feeling when you plug a Guitar Hero 2 controller, because you need a little gadget and even with it, it doesn't work really well.
So that's why I prefer the Online mode. I've played it for many hours and it's really fun. There's the Co-op , the Face-up, Pro Face-up and Battle mode. The sensation in online while playing at this game is really cool and stressing. That's a plus I think for this game.
Personally I think I don't need to talk to you about the other few modes, because it's the same.
Now lets talk about the soundtrack. It's the best Guitar Hero 3 lists of song. The buying list and downloading lists are also really good. There's some: Slipknot, Dragonforce, Killswitch Engage, Guns 'n' Roses and Lacuna Coil.
And Finally I want to inform all of you, that the game is hard to play. I've finish with no difficulty the hard mode in Guitar Hero 2 and I was at the 5th song list. But in this one, I've stuck at the end of the 7th list because its too hard. So you need to practice well or be really good to finish it. And if you can play in the Expert mode and you finish it, you are truly a Guitar Hero.