I suppose like any game from this genre its really for the fanboys anyway - lets hope the audience is big enough to make this a success!
As I mentioned previously in the chatbox sony is currently like in Party styled multiplayer games other than LBP , buzz and singstar
EDIT: Wow I read some of the comments on IGN about the Sony being a complete bunch of ripp offs etc and so-on - American gamers are going crazy (in a bad way) with this!
They forget that this was one of the most requested genre's from the Playstation community and PSblog and sony made it because of that... Anyway - the Journalist that played it seem to really like it!