I'm in NZ too, I've had the game since it was released (the mega big press version with all the fancy packaging, woohoo!), and I still love it.
The tracks are awesome to me, but that's because I love the music of Avril, Blondie, Sugababes etc.
Sony in NZ have confirmed that at least one addon disc will be out before Christmas over here.
The voice rating is totally accurate, you should see how hard it is to sing some bits of really fast songs like Livin La Vida Loca, or the highest bits in I Believe In a Thing Called Love.
You can turn the volume of the Mic's up and down as you sing, which is fun to piss off your friends when they're screaming some dodgy tune (turn it right up and embarass them).
There are party modes where you can have four people on each team (so eight players all up), and sometimes two 'allies' have to do a duet and then the other team does the same duet etc., or you have to keep your momentum above halfway for as long as possible etc.
It's such amazing fun, even when you're not singing, to just watch the music videos and see the notes onscreen fly all over the place
