Our Burger King is hands down the worst fast food place I've ever been to. Slow as snails (walk-in or drive-through), orders are often wrong, and this is the only fast-food place I've seen that has closed the drive through on several occasions due to "staffing shortages."
But the worst thing, and the reason I won't go there anymore, is that they try to cheat the timer put in place to evaluate their efficiency. The person at the window explained to me (honestly, not only are they cheating the system, they're dumb enough to exaplin it to their customers). There is a timer at the second window where you get your food. Obviously, the goal is to have people there for as little time as possible. They don't do well on that metric (big surprise). So, they ask you to wait at the first window until your food is ready, no matter how long it takes. Then, once your complete order is ready, the 2nd window person will tell the 1st window person to wave you up. You get everything and are only at the 2nd window a few moments, even if you do ask for salt or whatnot.
Of course, by the time he was done explaining it to me my food was ready, but if it hadn't been I would have moved up to the second window before they "told" me to because I won't be a part of cheating their KPMs. I won't go back.
The McDonald's in our town, on the other hand, is great...very quick, everything is right, always include straws for the milks (WHY do most fast-food places assume that drinking out of a milk carton/jug without a straw in the car is a good idea, expecially for little kids?), and they even toss in the little cookie packs in the Happy Meals.