The new imbalanced schedule, together with the fact that NZ have lost that aura, and SA are a great team and yet frighten nobody, makes for a great championship. Argentina are a daisy team, some days they do, most days they don't. But when they do they are electric.
SA are a team waiting to be spanked by any ref who gets the game going. They have been getting away with a lot for a while, and I think over the next two years the tide will turn. It might not be in time for the next WC.
NZ still have innate awesomeness, but they look vulnerable at the breakdown and their pack as a whole seems unable to neutralise the opposition strengths as they used to. Without that they look human and mentally frail, but I would not put it past them to change the coaching team and ve successful, just like SA did.