The Ontological Argument for the Existence of God

[Whateverist]

I have never seen this argument before, so I'm interested in some discussion of it. A philosopher by the name of Alvin Plantinga states it this way:

The Ontological Argument

1. It is possible that a maximally great being exists.
   
2. If it is possible that a maximally great being exists, then a maximally great being exists is some possible world.
   
3. If a maximally great being exists in some possible world, then it exists in every possible world.
   
4. If a maximally great being exists in every possible world, then it exists in the actual world.
   
5. If a maximally great being exists in the actual world, then a maximally great being exists.
   
6. Therefore, a maximally great being exists.
   

Thoughts?

Bleh!  Pretty much what others have said.  If it is both possible and necessary that a maximally incompetent being exists, then it is possible that you've misidentified God's true nature.  So long as we can't be sure which is the actual nature of 'God' there is at least a 50% chance that God, though existing, is no one you'd want to hang with.  Therefore fuck gods.  QED.