Rock Band 2 
Mario Party 8 Overall Comparison The main reason Rock Band 2 wins this comparison is the ability for expansion. Also, everyone likes music, which makes Rock Band 2 more appealing to non-gamers. The fact that Rock Band 2 has a no-fail option means that no one gets frustrated during parties.
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Comments
My only problem with Rock Band and Guitar Hero is that they keep coming out with new instruments. I have 2 GH2 guitars and a rock band drumset and now I feel like they are totally obsolete.
I hear that. I actually decided to give my old RB instruments to my sister so I could get the new ones. I'm also probably not going to get GH:WT for a while because I don't have room for all the other instruments, not to mention the cash.