Maybe you misunderstood my point or I didn't make it clear enough.
All raw food comes from the same place and is the same. Ingredients are the same for all quick service items except for maybe buns.
At some resturants, the equipment is different. That's what I meant by how its cooked along with who cooks it. You are right in that it depends on who you have preparing the food.
Each place is different in terms of how its prepared (cooked), who does it and how food is kept warm.
I worked in Epcot @ Liberty Inn and picked up shifts at EU, Peco's Bills, Cosmic Rays, and the Backlot.
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If a resturant is extremely crowded, the cooks will order lots of burgers to be cooked (usually 12 at a time, sometimes running machines straight thru with meat). Often times food is ready to go before someone on the counter is ready to fill that order and give it to a guest.
When a resturant is not busy (for Liberty Inn, about 1-4 pm), emphasis is placed on cooking to order. This way food is fresh. If you're ever at a resturant and no one is there and it takes a few minutes for it to be given to you, its probally being made cooked to order.
Hamburgers are special orders and are cooked to order at all times. Cheeseburgers are the normal thing and are usually cooked in multiples of 6.
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If I knew what was ordered and when it was, I could give a better explanation of why the food may have been so bad.