Hidalgo on 21 May 2010
http://www.mcvuk.com/news/39103/MTV-expected-more-from-Rock-Band-in-Europe
To sum it up, they think there were many circumstances that made the game sale worse. They think that, apart from weak economical momentum, Guitar Hero managed to capture peoples attention. They also think that won't be an issue for Rock Band Green Day.
IMHO, sales are really poor, specially if you take into account how low the sales have been for the country where The Beatles come from...
