Though it has some problems, Rock Band should be in everyones collection.
Right now let's talk about the good, Rock Band the best multiplayer game of the year(local multiplayer at least). Playing Rock Band with my friends felt like we were a real band almost too real at times. The game includes two new instruments, a microphone and a drum set. A microphone feels like exactly something out of a karoke game while the drums is something completely new which will have to keep coming back to play again just like the original Guitar Hero 2 years ago. We'll talk about the other instruments later. The games setlist is great with a wide range of genres and tons of songs for DLC if you get bored of playing Reptilia too much. The games multiplayer other then local has quickplay where you play with other people to fill a band which is fun if you are bored and have nobody to play with. It also has Score Duel where you battle against someone to get the higher score and Tug of War where whoever hits more notes win. Both are fun but nothing special.
Now onto the bad. If there's one huge problem people who have DLP,plasmas, and other HD tvs is that even with the game calibrated the game will read your notes late which will be a huge pain and sometimes prevent you from passing a song. Also the games instruments are really cheap. The guitar is terrible, the frets are too close, and the strum sucks. The microphone won't read your singing sometimes and if you singing on expert you won't stand a chance. The drums won't read your notes sometimes when you hit it and the kick pedal can break very easily and most people have had to return instruments because of these problems and I know I didn't pay $170 for some bootleg instruments. It also doesn't have a bass career which is a bummer.
Other then those problems Rock Band is really fun and is the perfect game for you and your friends