I never read the codex regarding Darkspawn, and I realize that they aren't "boring" or "generic." And I also know that they have a true "drive."
The whole point of the Darkspawn is that they personify humanity's thirst for power. The Tevinter Mages already had unspeakable powers over the elements and such, yet they wanted more. As a result, they tried to move on God's domain. However, they were too weak-willed to actually be able to take God's powers, and were thus turned into the Darkspawn. This also lead to the corruption of the Fade.
Now they are driven to search out Old Gods to awaken and corrupt, so that they can gain more power.
That seems pretty damn deep to me...
Long description =/= deep.