I personally NEEDED all of the 2x4s I received when I first got here (under a different username, way back in the day). I didn't want to HEAR them, mind you, at least not at first, but when I look back it was some of the best advice I'd ever been given. I just wished I would have listened sooner.
Message forums should be freewheeling, and self-censoring. If someone's advice doesn't hold up to the intellectual rigor and scrutiny, by others dissenting and explaining WHY they disagree, then it gets dismissed. As it should be.
A healthy message forum needs both vets AND new blood/new thinking in order to be effective, IMHO. But what do I know.