Jesus seems to me to be a cumulation of human ideals. Starting with respect for birth/life in the treating of a child as a king, and ending with the example of owning up to your humanness, sacrificing yourself, owning up to your sins and putting your faith in God. Jesus is an example, not merely of how we should treat each other, but how we should treat ourselves. We are all true Children of God, and we all need to sacrifice that which is human, that stuff that we hold most dear, that stuff that keeps us from God.
Of course, the Biblical Jesus more than likely does not match up with the Jesus that perhaps actually walked the earth. Also, the sacrifice as portrayed in the Bible is pretty pathetic as Jesus seems to know that he would be rising in less than three days after his death anyway, so he really lost nothing, especially as the Bible has him occupying his body again. You tell me what he actually lost and then I may buy the Biblical sacrifice.
However, not withstanding the tirade that was the last paragraph, the concept of a god become man, or half god half man, is a common one in the minds of men, and I think my first statement helps to capture that thought. My favorite death of a half man half god has to be that of Heracles, for when he died his human half went to the underworld for punishment, but his divine half went to live at Mt Olympus.