Great game and awesome fun. You must love Guitars and Rock music to love this Game truly.
Learning curve is about a half hour and the tutorial helps a great deal for a first time GH player. But the game become more and more challenging as we go from easy to Medium to Hard and then incredibly tough in the expert level.. If you haven't played GH ever and if GH3 is your first time, then the expert level would be a night mare.. But i hope eventually i'll be able to get it right.
Its one of the best Party games and can easily get everyone involved in it. It has this amazing feature where if you fail at a song then you can go to the tutorial of that song Play a part of the song of the full song in 2 speed levels - slow, slower and slowest in order to master the notes. Its helped me a lot on the really fast songs..
Overall, even after 10-15 of gaming i'm as excited as my first day with this game. I highly recommend this game to anybody who loves guitar, in fact its a Must-Have. For one who is not too much into guitar - Play this game and you'll fall in love with rock music and guitar!!!!