If it wasn't for the fact that 90% of the Kiwi players play for NRL teams they wouldn't have the skills to beat anyone.
That's the NRL's predicament, their policy is to accept players from all nations and provide coachs to overseas teams just so the skill levels of overseas teams can be raised enough to compete with an Australian side. Ultimately it knows that if these types of events are to go on and attract a half reasonable TV audiences and the dollars that go along with it, they need to go down this path. Afterall, I don't think you'd expect to go anywhere near filling Suncorp Staduim if Aussie sides continiually whopped all international sides 50 nil.
So, well done the Kiwi's but a more well done for all the NRL sides and coaching that allowed the competition to be there.