Tim Wengert, my opposite number at the Lutheran Seminary in Germantown, has just published a thought-provoking book on Luther and the Bible, Reading the Bible with Martin Luther.   In applying Luther's canonicity criterion of 'What pushes Christ' to the Left Behind series, he says the following:

By Luther's criterion, the Left Behind series (or, as I like to call it, the "Home Alone" series) is not worth a person's time, unless perhaps he or she is caught in a lake cabin during a snowstorm and has already read all the Danielle Steele on the shelves.  But even then one may prefer to use them as fuel for the fire.

Hard to believe that even Doc Martin himself could have put it so beautifully.