I've had nothing but sub par experiences at subway, but I also have a nice variety of deli options in NY that most people around the country do not have immediate access to.
Relative to fresh delicatessen cuts, subway can't match up in price, quality, or taste compared to something I can get from Katz Deli or Carnegie Deli or Cherry Valley. Especially good pastrami. That is hard to come by.
Fresh food and food quality in general is a big deal in Australia, fresh meat and vegetables and health food stuff like that in general is pushed way harder than fast food here, so those places needed to have better standards to actually succeed here.
The chicken they use is from well known Australian owned brands that provide good quality meat and potatoes and stuff like that to all kinds of places around the country. So while you may find the not so great instance of KFC or something somewhere, most of the time it'll always be pretty much consistently good in quality, or else people make a huge fuss.