When I was back in the States, we stopped at a few Burger Kings when we had the kids with us. The food was definitely better than our local BK here where I live in Norway, and, of course, cheaper.
When you travel, you have to ask the locals where to eat. When I was in France and in a hurry, I just went to a deli or grocery store that sold fresh salads. Best fast food, ever. The food in England is horrible, but you have to go to ‘ethnic’ places, like an Indian restaurant or Moroccan place. They are the only place for tasty food in England. Scotland is better with their food choices, I found, for some reason. Malta was a bit hit and miss, but, after asking for recommendations from local people, and making it a point to NOT eat at the hotel we were staying at, we found some amazing food. On Malta, the most difficult thing was finding a restaurant that had a bathroom that worked, oddly enough.
For me, trying the local food and wine/beer is a big part of travelling. Eating at a fast food chain just seems to leave out a good reason for spending the money to travel in the first place.