I don't think any of our DBs are "terrible".
I think they are all average talents trying to cover WRs with very little pressure on the QB for long stretches in nearly every game this season. Considering we lack any difference makers, and considering what has been asked of them, I think the fact this young group has played well enough to keep us in the hunt says they aren't terrible. They are improving young guys playing a very difficult and largely thankless position in an era designed for the QBs to thrive.