Rock Band 2
Ok firstly I have both so I know what both games are like to play. There are many good and bad things about both games, for example...
Rock Band 2 advantages, the tracks are far better then the ones on GH4 and there is a more wide range of them available to play. The tracks are also better to suit the drums and guitar.
Rock Band 2 disadvantages, the drum kit is too loud when hit so you have to have the volume loud or have your headphones in.
However, if you want to eradicate this problem Rock band have releases a new improved ION Drum Kit, and I just have to say that, that drum kit is amazing it is not loud when hit and just make the game more fun to play.
Overall, Rock Band 2 is very enjoyable and fun to play; the playtime is very long so you will still be playing it for ages before completing it.
Therefore, I am going to give this 10/10 as it is good to play but you would need the ION Drum kit to have with it as it makes it more fun. Great game!