Note, I come from an area that had little fast food options within 1 hour of me for most of my life.
Favorites- HotHeads Burritos- Love that place, like it better than Chipotle's. My favorite fast food joint now that they've moved within a 20 minute drive from my place. Five Guy's, Steak N Shake, Firehouse and Kewpee's probably round out my top 5.
Least- I've only ate at White Castle once as a kid, and I'll never eat there again. Taco Bell is decent at best for me.
Sadly, McDonald's is really dulling on me. Remember, how I used to get so excited to go out to eat at McDonald's growing up as a special occasion as a elementary school kid. Ate at McDonald's about 3 times a week when I was a freshman/sophomore in high school during the summer (I got hooked on their McChicken's and ice cream sundae's after lifting). Used to go there after high school football games and chow down. Nostalgia isn't enough to get me to come back by myself though..