Agree, the tournament in this format is like 3 mini series. The first two NZ/Aus games have purely been Bledisloe Cup matches, the RC hardly came to mind - even when NZ scored their fourth try last week the commentators didn't pick up on it until the restart.
There needs to be alternating match ups every round to keep everyone involved and interested, as lets face it, its hard to have a proper 'tournament' with only 4 teams. I'm not sure of the current discussions but it would be great to see Samoa and Fiji/Tonga involved - the two pacific island places should be achieved on merritt each year to keep them competitive and we can then use the 6N format which is fine.