Actually, the best cheeseburger on property is over at ESPN Club. I know many don't know about it, but it is the best.
It is not like the other cheeseburgers in many of the counter or TS restaurants. The quality of meat is better, it's thicker, and the toppings are fresher.
I've had the cheeseburger in most restaurants and agree, for the most part, taste the same. ESPN's is different and you can tell when you see it and eat it, and taste it.