Rock Band is as innovative and original to the 'music game' genre as Guitar Hero was before it.
Now you can have that same feeling. While working with your friends to accomplish an overall score, while competing to play, or sing, better than your friends are respectively doing. Its kind of a unique concept overall. Plus the whole 'world tour' career mode for the bands is genius. The game challenges you and even though the guitar is slightly easier than it is in Guitar Hero, it's still plenty challenging. You'll think you're hot stuff until Flirting With Disaster show's up out of nowhere at a Southern Showcase and kicks your butt on hard...
But them's the breaks, kid. Go out there and be a rock star!