I think Guitar Hero series has run its course. I see Rock Band to be more complete. (obviously since it adds other elements) And Rock Band actually lets you create your own band and customize the characters.
It's fun, but the gameplay's novelty's worn out. All it can rely on (as ever) is additional downloadable songs.
Oh, and I hear that they're trying to milk the series by making band-specific Guitar Hero games now. Guitar Hero: Aerosmith, for example, is coming out in June.
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