MMO communities can often appear to devolve in to 'us vs them' arguments, or the loudest (i.e. those who post the most) people being the ones who appear to be driving popular sentiment. I've thought for a while now this was due to the way forums work - whoever can post the most can control the direction of the conversation, particularly if they can do it over a page or so, since most people don't read all of a multi-page thread before posting their opinion. Sometimes this control can take a perfectly sensible conversation off into realms of idiocy, particularly when a bunch of people jump in with "/agree" or "/signed" posts. It can appear that a large number of people support some very stupid ideas.
However, it turns out that there is a reason for this kind of behaviour hardwired into us - a psychological study has indicated that if only one member of a community repeats their opinion several times, bystanders are likely to take that opinion as representative of the whole group. If three people repeat the same opinion, the results are a bit stronger, but not by much. It's the repetition that makes people think that the opinion is held by the majority and, barring a bystander having a strong contrary opinion, it makes them more likely to hold that opinion too.
As a social animal, humans generally hate sticking out. So, if the first time you've ever heard of the +4 Rogue Dark Sword of Enlightenment being overpowered is in a thread where everyone is saying the same thing (despite it being an echo chamber fueled by the same three people) then you are more likely to think that Dark Sword must be overpowered... and then "why haven't those stupid devs nerfed the Dark Sword already!!!".
So the next time you see something posted that you disagree with, it is in your interest to comment. The more devs / customer managers see a diversity of opinion, the more likely they aren't going to think that the loudest voice has the majority on their side.