The Ontological Argument - valid or debunked?

[Angrboda]

Your parody about the greatest conceivable girlfriend illustrates nothing. 1) the qualities of such a person would be subjective and 2) there is nothing about such a person that would make her necessary.

To defeat the argument, you are left with showing why premise 1 is not true. This would require you to show that the concept of a maximally great being (God) is illogical.

The properties that make up 'greatness' are equally subjective.

The proof is fatally flawed because it assumes the possible objective existence of positive and negative properties. Properties themselves exist, but they are neither objectively positive or negative. In short, there is no objective, natural ordering of any set of properties such that for any P(i) and P(j) in the set, under all possible worlds, P(i) is more positive than P(j), or vice versa. You can say nothing about the ordering of properties in all possible worlds, therefore it is impossible to postulate a being that is essentially positive (using the definition of "essence" given in the Wikipedia article).

The concept of a maximally great being is illogical because the concept of 'objectively great' is incoherent.