Again -- that's the purpose of a blog/message board. SO people can vent their feelings.
I'd argue that venting is not
THE purpose of a blog/message board. It is
A purpose that some may or may not agree with.
MY purpose for participating is to learn more about what I'm watching from more experienced hoops fans. I find the more I know, the more I enjoy my time watching the Celtics. Howling rants do not serve my purpose, though I won't for a moment claim those are necessarily inappropriate unless they violate the rules.