Slashdot is just as likely to make good posting invisible at -1 or 0 as happened to a very good reply of mine to a dimwit, but that dimwit was one that spouted pro-GPL nonsense claiming that people who want the BSD licence want to take advantage of others etc. Complete BS! But as there is a pro-Linux/GPL attitude here, those who are pro-GPL come in and downmod anything they don't like. Whether it's true or insightful doesn't matter. This is bullying, not really different than making nasty comments and chasing people away from newsgroups.
You might want to read this about this problem:
http://swhs.home.xs4all.nl/kritiek/linux/
And for more about the problems on forums and newsgroups (which are autists, bullshit artists, zealots, people who feel the need to defend and expensive purchase and do so in a stupid way, ditto for viewpoints, and more), see this page:
http://swhs.home.xs4all.nl/kritiek/discussies/index.html
I find most postings to be really poor on slashdot, very little information content and the nutters who come up with silly stuff that it essentially made up (be it about global warming or about BSD people wanting to take advantage of other people's work), keep posting the same shit over and over again.