-1, and I'll do one better: I'll explain. I believe the
goal of the SE network is to provide useful information to anybody looking for it. The
means to that goal is to encourage users to contribute useful content, and modify existing content so that it becomes (more) useful. Commentless downvoting can advance the
immediate goal (by ensuring that the content most useful to the most people rises and gets noticed), but it shoots the
overall means in the foot (because it makes it harder to improve that content, and the author cannot correct himself for the future). —
HodofHod Dec 14 '11 at 6:41