Well, I don't know if corn is bad per se, or that much worse than the other fillers. But, in the U.S. at least, with all the subsidies corn farmers get, they try to stuff it in everything. They have some form of protein they have engineered out of corn, and use that in place of animal protein in some foods. I just think it's pretty unnatural, and if corn is the main ingredient in cat food, that food is most likely being made in the absolutely cheapest way possible. Almost all of the main brands have some corn in them.
Cats are primarily carnivores. And corn is not a very nutritious vegetable to begin with.
