That's nonsense. There's nothing wrong with the format, except Italy's inability to up their game.
Nope - the format is non-sense.
1. Playing the same old sides year in, year out in a small league - yawn.
2. Having a format where some sides play 3 games at home and others 2.
3. Finishing anywhere other than top provides no benefit (e.g. qualification for some other higher level tournament), nor consequences (e.g. relegation) - meaning that once a side is unable/unlikely to win the tournament they frankly don't give a sh*t, using the final games as useful training exercises.
4. Playing the same old second string sides doesn't help develop NH teams (as we see again and again at the world cup) - what the NH sides need is not another yawn-fest 6 nations match against Scotland, or Ireland, but much more regular matches against the SH sides in a tournament that means something (and the Autumn internationals mean nothing and the Lions is just an acceptance that SH sides are better and doesn't help individual NH sides one iota).
5. A league structure with so few teams is really outdated unless it leads somewhere - the 6 nations would be much better if there was a knockout stage (and NH sides need much more experience in knockout matches if they are to be more successful in the world cup).
And that's why 6-Nations match days in Cardiff are all about the drinking and the 'event' rather than the rugby - the guy sat next to me missed about 30 mins of the match queuing at the bar, the guy the other side of me seemed to have no clue about the basic rules (kept saying 'err, what happened there to me') and the woman in front of me spent the whole match taking selfies.