Good points and thanks for the links. I find those very helpful.
My pondering, though, wasn't about how to spend my votes. I find many things interesting and educational.
In reviewing the nodes that appeared on Worst Nodes over the last several days (and reading the all-time residents), I saw nodes appear that I interpreted as reasonable questions/comments. My question, then, was an attempt to draw out the reasons why people vote down.
What criteria do you use to vote up or down?