The major sin of the rolling maul is it makes the defence defenceless, against all principles of any sport.
Rugby otherwise outlaws obstruction. Act as a dummy runner, crossing in front of the ball carrier and blocking tacklers, and it's a penalty to the tackling side. Accidentally run into a team-mate so he is briefly between you and the tackler, and it's a scrum with the opponents getting the put-in. But a rolling maul, formed offside and blatantly obstructing everybody else ... well, that's just peachy.
It's like rugby jealously guarding (as it does) the principle that a pass must be thrown backwards, but introducing a rogue law that says it's OK to throw the ball a long way forwards on condition that a prop is standing in the opposition 22m zone, wearing odd socks and singing a verse from Eskimo Nell. It is that stupid and far removed from the essence of the game.
There's also the aesthetic complaint, that these are the most boring tries and moves ever seen on a rugby field. They are about as creative as a bowel motion. All the rolling maul achieves is to push defenceless opponents out of the way.
The referees often get it wrong. As Richard Loe pointed out after the opening match between England and Fiji, England's rolling maul try involved a truck-and-trailer (when the ball carrier is separated from his colleagues, an illegal act) and therefore should not have been awarded. But, of course, in a game of endless recourse to the video ref, that one passed without comment.
It's got to the stage where the World Cup could well be won by this criminally stupid loophole. If so, please write to World Rugby and tell them you have bequeathed them your testicles upon death - because they clearly have no balls. They had the opportunity to alter or ban the rolling maul before the World Cup but chose not to.
World Rugby may change it after the tournament but it will look like they are only doing so because the minnows are working the trick against the big boys.
That's the other thing - to many Southern Hemisphere eyes, it looks an abomination in a game built on running and passing. In the north, however, players and crowds often seem happier when everything is locked in a morass of straining sinews with the game played in a dark space fans can't see. It makes you think of US satirist PJ O'Rourke's summary of the English as people of dubious sexual practices and bad teeth who used to rule half the world but still haven't figured out central heating.
Having said all that, it was a surprise to see Australia's first match against Fiji mainly characterised as a flawed effort. Apart from their rolling maul expertise, the Wallabies showed they have the best defence yet seen in this tournament. They bossed the breakdown in a way that brought to mind the defeat of the All Blacks in Sydney. They played Pocock and Michael Hooper together again and the latter, if he is not already the world's best No 7, is pretty close. Australia remain, to these eyes, the greatest threat.