Highly addicting.
The concept is pretty basic. It's like Dance Dance Revolution but with your fingers. You have to match the cords with your guitar. Sounds simple. But it's really not, haha, least not for me.
The easy difficulty is actually good for beginners, like me. You only have to worry about the first three buttons on the guitar. And the notes are usally well spread out. But, once I tried medium difficulty was tossed a challenge. Moving my finger to the forth button was not easy for me and you have to play more notes which can be pretty close together.
I'm sure there are many players out there that can take this thing and do very well. Then there are people like me which will need to do the practice sessions repeatedly to get decent on anything higher than easy. There are some advanced ways of playing the notes but getting my fingers to move and strum at the right time is, at this time, beyond me.
Audio: The track selection is good. I really had a fun time playing and listening to the music. Some of the tracks were recorded by the original artists. While some were performed by cover bands. Were they as good as the original artists? I really didn't think much about it.
Graphics: something you aren't going to notice as you'll be very bust watching the colored noted float down. You can also purchase different guitars, clothing, guitarists, etc. But I was so busy trying to play, the only time you will notice your guitarist is after the song is over. There are also some cut scenes after your complete a level. The graphics do not impact this game in anyway.
Replay Value: high. And I mean really high. The more you play the better you are going to get. Which equals to even more fun as you strum along to more complex chords. There are also many tracks you can download via Xbox Live that will help in keeping this game fresh.