I sorta know where you're coming from on that, domer. My own feeling is, the less rules the better. Most of us will comment before re-posting an article, but sometimes anything more than a one-line description is superfluous.
Say someone isn't too articulate but finds an article which he/she feels expresses his/her thoughts better than he/she ever could. Why force that person through the embarrassment or pain of summarizing an article which actually speaks for itself, and will itself spark debate better than the summary ever could?
That person made his or her contribution to the debate by finding and posting the article. Why force him or her to go further if they're not comfortable with it, just to "prove" to the rest of us that they're not a parrot? Hell, I'm willing to assume that anybody who participates in this forum in any way (even by merely reposting an article) is not a parrot.