I lived there for 15 years. Without wishing to piss on anyone's parade, anywhere looks good on tourist adverts, or on a summer's day! And, like anywhere, there is good and bad.
I did find, in retrospect, the general go-for-it attitude that the country instils in it's people to be great... but it took for me to arrive in the UK and deal with almost the exact opposite on a daily basis to realise it! It is a great place to be for sport and the great outdoors, it's so much a part of the everyday life of so many. On the flip side, you are far away from artistic and cultural variety. When I left, in 1982, I was hugely into punk & new wave music and NZ was a f*ck of a long way away from where it was all happening - I couldn't wait to leave!
Would I go back? My priorities have obviously changed and NZ is, ironically, a more attractive place to me now than it was when I was 18 but, no, not now. To be honest, I have no desire to even visit.