Yudhistar didn't not stake draupadi by himself . It was duryodhan who ask to put draupadi in stake even yudhistar didn't not like it when duryodhan ask yudhistar to put draupadi in stake
But yes yudhistar fault he keep forgiving kaurav and always addressing kaurav as priye anuj where as duryodhan never consider pandav as his priye anuj
Due to anuj ( bhai ) ka rishta he keep forgiving duryodhan misdeed which was major draw back of yudhistar
And he keep forgiving because he don't want quarrel in family
Yudhistar called as dharm raj because he did not follow any illegal means to achieve any thing
Like when in Mahabharata yudhistar were ask to speak lie that ashwathama mara gaya so in this case yudhistar did not want to speak lie
Though by speaking this lie it was going to for benefit for pandav in Mahabharata war but still he don't want to speak lie
But when he was explain why should speak lie then he say ashwathama mara gaya nar ya hathi ? 0
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2 he doesn't not leave path of truth even in worst condition
3 he was impartial
4 he use keep other wishes in priority over his own wish like when he pandav were very thirty
When pandav ignore yaksh sentence that first answer my question then u can drink water but 4 pandav ignore yaksh statement it was only yudhistar who did not ignore yaksh word and first he answer yaksh question and then drink water
I think due to all these quality yudhistar call as dharm raj