Darkness is the least of the naming worries. I think the dumbest one was Disintegrate. It used to do just that, and now it doesn't. Silly. Disintegrate wasn't even overpowered, especially give the fact there there are lower-level death spells.
Darkness, however, was grossly overpowered and dumb to boot. First off, even darkvision couldn't penetrate it. That much was stated. That meant that almost everything that had it (drow, tieflings, etc.) had no reason to use it because they'd hurt themselves as much as they hurt others. On the other hand, those with blindsight became unstoppable in the effect of a Darkness spell.
Generally, I interpret the spell as "reduces light to shadowy illumination".
People, y'all gotta start considering the intentions of rules along with the letter of the rules. I'm more worries about the non-disintegrating Disintegrate than the non-totally dark Darkness.