They typically argue with what their website says the have. They don't understand that "plain" or "only meat and cheese" means no ketchup, onions or mustard. They give the wrong condiments and take forever to begin making the order. Through the window you can see them wrapping up a conversation about their personal lives BEFORE cooking the meat or fries or whatever you ordered.
The only redeeming quality is the flavor of the food itself. So if you're good with the default set up of a burger and waiting twice as long for it to be made if they decide that the menu item you're ordering exists then go for it. And if the website is wrong then maybe it should be dealt with.