It's very simple, and I've said it before. The Internet, including game forums, are overwhelmingly negative. People flock to the Internet to complain; rarely to bestow praise. We, as people, thrive on negativity and conflict. It's why the media reports on conflict and friction more than "the good stuff" that goes on in the world. It's partly why negative Presidential campaigns have more impact than positive ones (though that also has a lot to do with people generally being risk intolerant vs opportunity seeking).
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Back to FD/games: In the run up to a new game or release, a gaming forum is comprised to people excited for the game - and thus generally more enthusiastic than negative. As it launches, and after a short while, that positivity is leveled out with an influx of complaints and negativity. As several weeks, months or years go by, most of the positive is steamrolled by the negative as people are generally flocking to a site to complain vs bestowing praise. BUT - and this is crucial - that does NOT mean that the majority of gamers are unhappy it's the game. At this point, a vocal minority is skewing the result. Want proof? Pick any game that you know to be hugely successful and visit the forum a year following release. From the forum you'd conclude that the game was absolute garbage, yet you know it's hugely successful. It's the vocal minority at work. It's the Internet doing its thing. It's why every single gaming forum/community eventually turns toxic. This forum, for example, is absolutely nothing like it was 1.5 years ago. It's far more negative, far less polite, and - frankly - far less constructive and mature. Welcome to the Internet!