Here are two great articles on what is wrong with missions. The first is by Doug Wilson. The second is over at the Bayly's Blog where they agree and add some nuance to what Pastor Wilson said. Both are worth your time and thought.
Pastor Doug Wilson's Post
The Bayly Brothers' Post
Let the saints be joyful in glory, let them sing aloud on their beds, let the high praises of God be in their mouth, and a two edged sword in their hand, to execute vengeance on the nations, and punishments on the peoples; to bind the kings with chains and their nobles with fetters of iron. Psalm 149:5-8