Stephen Grover offers an interesting version of the Mere Addition Paradox (‘Mere Addition and the Best of all Possible Worlds’, Religious Studies, 1999) against Swinburne’s brief argument (The Existence of God, Oxford, 1979, 114 ff.) that there is no best world. Swinburne’s argument goes this way.
… take any world W . Presumably the goodness of such a world.will consist in part in it containing a finite or infinite number of conscious beings who will enjoy it. But if the enjoyment of the world by each is a valuable thing, surely a world with a few more conscious beings in it would be a yet more valuable world W’ . . . I conclude that it is not, for conceptual reasons, plausible to suppose that there could be a best of all possible worlds, and in consequence God could not have overriding reason to create one.
There are good reasons to deny that Swinburne’s argument shows anything like there is no best world. Still, the argument does not suffer from the Mere Addition Paradox (MAP).