These reasons sums up why MasterChef Australia is better than MasterChef US
People enjoy watching MasterChef AUS because of the contestants and the food they cook, not because of the drama.
MasterChef Australia is by far the best MasterChef there is. The quality of the recipes, the behavior of contestants, the calibre of the judges and the overall tone of the shows are far superior in the Australian version.
Although IMDB is not the authoritative portal for viewer perception, it does present a fairly reasonable view of how viewers perceive TV shows and movies. As such, IMDB Australia is rated at an 8.2, whereas the US is rated at 7.3. The UK version has too few votes, and the India version is not present on IMDB.
Masterchef Australia is to the point. It's based on food, on home cooks and culinary. It's challenge oriented. The judges seem real and true to the cause. There is no drama. Even when sentiments come into picture, It just takes 5 minutes for them to get food on the screen again. Doesn't mean that home cooks are not that dynamic or doesn't have those stories but since this is about food, Contestants somehow become secondary.
Masterchef US - Full of Personalities. You don't see contestants in the home cooks, You don't get to see food. The main focus is that unique personality a person has. Loudness of the character, That unique persona is what comes on the screen before their food does. The challenges are not the main orientation but the fights and conversations that go during the challenges are. Gordon Ramsay, No matter how much I respect him and love him for his amazing culinary heights and inspiring career, is known to have a loud personality himself. He adds to all the drama that goes around. Somehow it feels like an intense movie going on.
It's certainly an attitude of what Hollywood wants everyone to think is the US. For some reason, reality American TV producers have come to the belief that only conflict and drama will work to keep their shows going and the advertisers paying. And as an American, it bothers the hell out of people