What distinguishes a plain old D movie from one that earns a D-? Check out today's Ask the Critic Question and post your own

What’s the difference between a D movie and a D- movie?

What is the sliver of greatness separating a D movie from a D-minus movie? —Jennifer Leigh Rork

I’d rather examine this perceptive question from a glass-half-empty point of view. See, a D movie like When a Stranger Calls is bad. But a D- movie like Firewall adds a certain spirit-killing cluelessness to the mix, hovering helplessly over the pit of a flat-out F. But since the F-letter is reserved for movies that aren’t just bad, but also reprehensible (yes, I mean Pay It Forward), a sickening-thud D- is about as close to hell as a movie can get without even the satisfaction of hitting rock bottom.

(Got a movie-related question for Lisa or Owen? Post it here.)