Harmonix gimped Rock Band, not everyone thought it was so bad. The first Rock Band game has served over a million customers in 2008, with the Wii version of the game outperforming all other consoles. Odd, considering the game had practically no features.
As for Rock Band 2, it's been less of a success story. Since the game released in mid-December, it has managed to sell only 150,000 copies. Will it eventually catch up to the first game? Doesn't seem likely, but only time will tell.