The thing people forget is that the message board is part of an official, commercial website. Because 2000 AD's website is more fan-oriented than most, some posters don't realise that posts here can impact on the company (Rebellion) and magazine itself. And yet I still recall the flack I got when reworking this section by putting the 'fan zone' graphic at the top of the, erm, fan zone. Too many hair-triggers, methinks...
Regarding Matt's general comment, I agree. Criticism is fine, as long as it's constructive. Saying "2000 AD is bollocks!" doesn't help anyone, bar possibly offering some strange relief for the person posting the message. If you don't like a story or some art, say why. Give reasoning. (To be frank, the same should be true for positives - saying _why_ you like something, rather than that you just do, is more helpful to the team and creators.)
I think more people should be honest with themselves about what they post, how they post, and why. If you're talking about someone's work, be constructive, and only say what you would to them in person. Don't be rude, don't be vindictive, and certainly don't be utterly disrespectful.