The wizard of oz was a charlatan, a huxster and impotent beyond his illusion, an apt comparison indeed.
That's not the great and powerful wizard I know. If by charlatan and huckster you mean someone who had the insight to know you can't do
anything for anybody, that one can only provide experiences
which allow for others to realize what they have known (forgotten?) all along.
Four companions travel the Yellow Brick Road to the Emerald City because they've heard the Wizard can grant what they're seeking. During their first encounter with the Wizard he tells them they must vanquish the Wicked Witch of the West. After returning successfully from their journey they present her broomstick as proof of their accomplishment. When they press the Wizard about what they came for he tells them to come back at a later time, that he needs to think things over. Toto sees not is all what it appears and grabbing the curtain pulling it aside reveals the real Wizard. Surprised at the new revelation, they all surround him demanding to know what he is going to do about his promises:Scarecrow: What about the heart that you promised Tin Man, and the courage you promised Cowardly Lion!?
Cowardly Lion, Tin Man (together): And Scarecrow's brain?!
He then gives them as a token a diploma, medal, and a ticking clock and helps them see that they had a brain, a heart, and courage all along! They had only TO REALIZE
it! He did so by sending them on a quest which would simultaneously help them reveal the very conditions they were looking for. All Dorothy had to remember was there's no place like home and by simply clicking her ruby slippers together, she broke the magic spell, waking up in her bed back in Kansas.
There's much more to the Wizard of Oz than meets the eye. This is just one of many fantastical secrets of Oz, the first Wizard Deluxe.
"Back where I come from there are men who do nothing all day but good deeds. They are called phila... er, phila... er, yes, er, Good Deed Doers."
- Wizard of Oz