This is what I said on a friend's Facebook account when they linked to the article:
"As with many things, I think it is a both/and and not either/or situation. Yes, I think when Jesus speaks parables like this, he is in a purposeful way calling attention to himself and what he does and will do. But I don't think it is only as a substitute or representative. He is also the example. When he says to "go and do likewise", it is not only to expose sin, by some kind of confronting dead end, but it is also to point us in the right direction (cf Calvin's third use of the Law). Sometimes we can over-theologise and over-absolutise etc. I suspect Pastor Tullian's theology is getting in the road of his exegesis..."Sometimes we can try to be too clever, and miss the obvious. Sometimes we can also be too tunnel-visioned or too monochromatic about seeing Jesus in everything. Sometimes we can be so afraid of legalism and moralism etc, that we are allergic to telling ourselves to "be careful to maintain good works" (Titus 3:8).