Summary: Green Day: Rock Band is a simple attempt at capturing the essence of a popular American punk rock band. This is a must buy for Green Day fans, but it offers nothing new to the music rhythm game genre.
Pros: All of Dookie is included, Provides a fine tribute for hardcore Green Day fans
Cons: Not as impressive as The Beatles: Rock Band, That there is nothing new to sink your teeth in to, The fact the game does little to attract casual Green Day fans
Conclusion: Green Day: Rock Band, not unlike The Beatles version released last year, is exactly what it sounds like: Rock Band for Green Day fans. If you like Rock Band and Green Day, then obviously this is worth checking out, but if you are on the fence about either, a rental will likely suffice.