Ah yes.... The old "God is the definer of morality, and therefore is not subject to it" trick.
Sort of a "do as I say, not as I do" thing on God's part.
That's pretty convenient.
Not at all. It's no trick to say that God is either perfectly justified, or else he is not. If he is not, he's no real God, and we have no business to worship him. If he is, he not only requires no excuses or explanation, but is utterly above and apart from all such probing.
If God is different from man merely by degree, he wouldn't be very interesting. Job's message is that God differs from man in an absolute, fundamental, and sovereign way (IOW, answering to no one), and thus the criteria for examining his ways are utterly different from examining the ways of men.
Even though you're not a believer, I hope you can accept on a theoretical level the distinction that Job makes.