Wendys and Burger King are a tie for my favorite.
Taco Bell (more like Taco Hell) has okay food but the place is disgusting.
YEah, I'm not too huge on Taco Bell. I got a $15 gift card to the place. I might exchange that with a friend for $15.
Giros and Souvlaki... Both are Greek fast food. Must be made by a Greek, in Greece (preferably near the sea in the summer). The first one you try when you get there delivers an unexplainable sensation ^_^ Damn, now I am hungry, lol.