Also, "Dark Ages" is a... subjective term that was applied afterwards, only applied to one part of the world, and ignores what actually did happen in... what, a near-millenium, right?
Yup. It also got applied to another time period (the so-called Greek Dark Ages, the time period between the Mycenian and the Archaic/Classical age), for much the same reason (namely that little was known about that period at first). Later on, as research uncovered more and more, it got replaced by other, more descriptive terms. It's still used for a period of about 50 years but only because we tend to have a hard time letting go of terms once we've coined them.
The "Dark Ages" as a term for the Middle Ages has been phased out by historians quite a while ago.