Subway as we all know has multiple outlets here. One of which I would like to describe here in my review. Subway is known for its breads. Trust me if you like your breads to be stuffed with more indian flavours then this is not a place where you would like to find itself.
Why people have a more attraction towards mcdonalds and not subway the reason the same. May be outside india. You do a fantastic job but here in india in order to be more customer centric you need to add indoan flavours to your menu stuffs like lettuce and jalapeno would not enforce people to have your stuff. Rather coriander leaves can do your part here.
This is just my personal opinion. Different may may have different opinion.
All the best buddy!