People who regular post on video game boards, that is really the target audience of Wii Music.
Not surprised most people bash it here, what only a few thousand people come here, while millions will buy this. I could see people not liking a game, I don't like many games but people are taking hating to this game to extremes. Also games aren't what you define it as, games already have a definition and people will be entertained by this.
I don't want to buy this but don't have any reason to bash it and will play someone else's copy.