To answer, it would be best to look at what you said first of and then softened in your above post.
I think your view of Job is a little low on him as a person and his knowledge of God (why you take that view I don't know). How do you come to this conclusion? were in scripture do we see this (it's not in the book of Job). Certainly as all OT saints they did not know what God's plans were in regards to his ultimate redemptive plan in Christ, but they did live by faith, by God's grace.
All scripture is truth... again we need to go to scripture for the proof of this:
"All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness" 2 Tim 3:16
The book of Job is part of God's definitive truth that God has allowed us to know - as with all scripture from Genesis to revelation.
Lets have a look at what the website you link to really says about Job and I can only assume you agree with them:
In my view scripture disagrees with you and the website ministry you like to post links to (using this post to cover both above).
Here is what God says about Job -
"And the Lord said to Satan, “Have you considered my servant Job, that there is none like him on the earth, a blameless and upright man, who fears God and turns away from evil? Job 1:8."
And this hits the spot!!
"And he said, “Naked I came from my mother's womb, and naked shall I return. The Lord gave, and the Lord has taken away; blessed be the name of the Lord. In all this Job did not sin or charge God with wrong (Job 1:21-22)."
Yes Job had a hard time and could not comprehend why he was suffering horrendously. When we suffer as Christians we may all at times have the same thoughts and fears that Job had.. in fact that seems to be the experience of those who have suffered. Yet Job did not curse his God and die Job was steadfast in his faith in God. And if you do not believe that lets have a look at what scripture says:
"Behold, we consider those blessed who remained steadfast. You have heard of the steadfastness of Job, and you have seen the purpose of the Lord, how the Lord is compassionate and merciful (James 5:11)."
Job was not self righteous in the sense you are trying to convey, yet he was sure he was not suffering because of sin as his fellows were saying. God himself agrees with this. Job felt injustice was being done to him through his suffering and humiliation - something I am sure ''''If we are honest'''' Thats not self righteous in the sense of 'working the law' Job was as God tells us blameless and upright. He hadn't quite grasped something yet (discussed below).
Jobs friends seemed to believe that calamity was only sent from God onto the wicked and not the righteous aswell (remember God allowed this to happen, infact God said to Satan 'have you considered my servant Job ... A BLAMELESS AND UPRIGHT MAN). Your friends at escape to reality, have seemed escaped from reality in disagreeing with God.
Without the book of Job Christians would not have the same benefit of understanding the the infinite perfections of God as a sure ground of confidence.. Job learned this through his suffering as we see at the end of the book. This is why the book of Job is an important book to Christians (as with all the books). Yes we can now look at it through the finished work of Christ and this gives us even more confidence to be steadfast, for He is steadfast.