Fair play to the Aussies, they weren't breaking any rules and in fact used them to their advantage.
However, in future I think that the joker should not be allowed in the last heat, in fact they should scrap it full stop.
If you look at the situation last night, the Aussies brought in a joker as they were six or more points behind the leaders Sweden, in effect though the last heat was Poland v Australia and the Aussies were only 1 point behind. So the odds were heavily stacked against the Poles and had Crump beaten Gollob it would, in my eyes anyway, been a hollow victory.
You can't bring tacticals in heat 15 of a league match and you shouldn't be allowed to do so in the World Cup.
All irellavent though and Australia are OUT! Ha!