Chik-Fil-A is pretty good food. The thing that sets it apart for me is the service. Hell, they do everything except feed the food to you. I like Sonic and Zaxby's pretty good too. In-N-Out was good to me. Had a really good experience when I ate there. I agree with Snags on the Quarter Pounder thing, but it's got to be fresh and so do the fries. If it's not, then WOOF. I like Popeyes ok, but if I want fast food fried chicken, then get me on the Kaos train and hit up some Jack's.
I don't consider Five Guys as fast food. I think you need a drive through window to qualify as fast food. Oh, speaking of, I think Five Guys is a really good burger.