In theory, this is the function of the editor -- be it a section editor, a managing editor, or someone else who bears the title "editor." In practice, editors have been very hard hit by the journalism crunch. There are still plenty of fantastic editors out there; they're just not getting hired, kept on, or appropriately compensated for their contribution anymore. Editors' heads are often the first on the guillotine when the cost-cutting rounds begin. The editors who survive the purge are often wildly overstretched. Others are extremely green--college kids, hired for a third of what an experienced editor gets paid, under the misguided assumption that anyone with a journalism degree can successfully fulfill the responsibilities of an editor.

(For what it's worth: I don't know anyone on the Guardian's staff, and am making no specific accusations here.)