I pretty much expect to use drive-through at my own risk. If I go in and end up getting the wrong thing I probably return it, although even then I just don't care all that much about a whole lot of "wrong things" I might get at that kind of place.
Drive, through, though.. It's unlikely I'd be bothered going back. I suppose if the order was truly and ridiculously bungled I might. Other than that, though, I just feel like - in the scheme of all of life's/the world's problems - getting the wrong thing at a fast food place doesn't matter a whole lot.
If some meal is one that I don't want or like there's most often a next meal that won't turn out so badly. lol