Several points. It was discovered a bit by accident. The researcher who made the cat casserole was actually performing an autopsy on a feral cat corpse and noticed the quality of the meat. That's when she decided to try cooking it. Like all meat, it's quality and flavour will depend on the animal's diet.
Also, feral cats in Australia doesn't just mean owner-less cats 'out on the streets': it usually means cats actually out in the bush, unlike the wild cats of Rome, who still live in the city. Some people have been tempted to regard Australian feral cats as a separate species, although they're not.
Wade.