Jesus is our ‘propitiation’. This word appears four times in the Greek New Testament. Most translations don’t include it. They say, “People don’t know what the word ‘propitiation’ means”, so they put in other words like ‘sacrifice of atonement’. [But] people don’t know what those words mean either! So I don’t think it helps. Use the word. It’s a good word.
What happens with propitiation is that Jesus stands in our place and the wrath of the Father is poured out on the Son.
It seems to me that the very strongest thing about Mark Driscoll's ministry is that he trusts the Lord Jesus to save him from God's terrible anger against sin and sinners, and teaches accordingly. You can find more about his explanation here.