Additional thoughts on the poll and places-
1. This poll really needed to be broken down into component parts. Burger places. Chicken places. TexMex (Taco) places. And, um, other I guess? Or maybe with stricter criteria; perhaps a minimum number of states, like 20 or more (national chains). Heck, I just realized that Dunkies (aka, Boston Tim Hortons) isn't on it. Not that it would get many, if any, votes.
2. Regarding In-N-Out. The problem that a lot of people have with In-N-Out is that because it is relatively limited geographically (if you haven't been out west, you've never been to one), you may have only heard of it as this amazing place. So you go and you have these unrealistic expectations. But INO is not a gourmet burger place; instead, it's ... well, it's a California thing, but the way I think it's best described is that INO is what you'd get if McDonalds had stuck to a core menu and sourced fresh ingredients. It's the platonic ideal of the what the "American Fast Food" experience is. Plus they treat their employees incredibly well, which leads to a good experience, and they are famous for their (not-so-secret) menu, which is basically just "we will do whatever you ask with the limited stuff we have, and we have names for it." But if you're going in there expecting something other than good fast food, you will be disappointed. Also? The fries suck. If you get the fries, make sure to order them "well done" if you want them to be tolerable. Or just get them "animal style."
3. Sonic? Really? I get that people love their slushies, and enjoy ice cream. But while they have a plethora of food options, the one commonality of all of their food (other than slushies and their blizzard knock off) is that it isn't fit to serve to your worst enemy. It's just bad. Admittedly, I have been to a good Sonic, and the food was ... fine. But almost every single time I've had the misfortune of eating at a Sonic, I've regretted it.
4. When it comes to the burgers, I stand firmly in my assessment that the two best are Shake Shack (the Smoke Shack is probably my single favorite fast food burger) and Five Guys (all the way + jalapenos). Culver's has really good burgers, plus the frozen custard puts it over the top. Finally, In-N-Out is still the platonic ideal of the "classic" fast food of Americana, although the actuality of the burger experience can never live up to the California Cult that surrounds it.