Warren's teaching, actions, writings and associations are stand alone and can be measured against Scripture as such.
My concerns with Warren would fall into the primary (essential) category (one can't endorse and associate with false teachers, nor can one distort the Scriptures and remain true to the duties of a pastor and the doctrine of the gospel).
As I suspected, we don't agree on the definintion of a primary theological issue, and that could make further discussion difficult because we'll be talking right past each other.