I really don't share that view to me this is like watching a South Africa v Japan RWC final, one team can justify being there and the other got lucky, sure it could win but would anyone ever consider Japan the number one rugby nation in the world.
So the question is could you ever justify calling NZ World Champions?
I recall NZ winning the rugby league world cup and it was more embarrassing than anything because everyone knew Australia were the world's best.
In part I think these world cup formats should be ditched as they aren't indicative of world standings just who ever was better on a particular day.
Not sure how you draw that conclusion given that England lost more games than Australia and India combined, personally I think the pool finishing places are probably closest to world rankings right now.
1. India
2. Australia.
3. England.
4. New Zealand.