Used to love them as a student, as above, if you start with chicken, loads of veg on top, then the only real evils were the sauces and, apparently, the bread.
I guess the only criticism you could level at them is if they touted it as genuinely healthy (which they probably do, I just can’t be bothered checking the advertising). I think I was disappointed last time I got one, the chicken is no longer diced ‘real’ chicken but some sort of shiny looking revolting patty?
The smell is the weirdest thing, it almost has a life of its own! We worked in a 16 storey tower in Vancouver, and when a Subway concession was put in on the ground floor, there were naturally concerns about the smell permeating the building. Turns out the only floor it permeated was the ‘executive’ top floor due to an interesting example of the stack effect up the lift shaft effectively sucking the smell all the way up the building until the top floor. It was like a smoke test or something, they should have paid Subway for the privilege as it probably saved them a tonne of heating energy patching up the leaky lift shaft 😀