[edit] oh yeah, their bread is terrible. It seems to be difficult for a foreign food company to understand how important decent bread is in France. McD got a ton of goodwill when they introduced baguette sandwiches.
If you asked now Frenchmen who had experience with Subway, the majority of opinions would refer to it as « meh » or « pretty shit ». The so-called bread in particular has an especially grim reputation. But the rest of the ingredients also taste mediocre, especially compared to McDo.
McDonald's is such a part of the cultural landscape it might as well be French nowadays. It has much better staying power than any other fast food chain.
There are plenty of American sandwich places that have similar prices, and they all have better bread.
I never saw a single Subway in Grenoble, Paris, Tour or Lyon.
Everyone knew Quick was far worth than McDonald's. It's just that they always had insane promotions for students. They were never really profitable and ended up being sold to Burger King (the French state owned part of them for a time through a serie of strange events).
> I never saw a single Subway in Grenoble, Paris, Tour or Lyon.
There are 36 Subway in Paris, 10 in Lyon, 3 in Tours and 2 in Grenoble.
But you are right that Subway is not really popular. McDonald's is where people go when they want to indulge for cheap. If you don't mind paying more, there are now better local burger chains in France large cities (Big Fernand notably) and I think Asian food remains generally more popular than American fast foods in Paris.