Brink seems to have an effect on people, to downrate/trash other games that has features that Brink tries to avoid, like sniper fests, OHK's and what not.
It's quite simple. Everyine who is not busy playing these games, is looking for something better, which Brink is. With a bit of common sense, you'll soon realise that they all ran away and don't want their only hope to be destroyed.
For some reason, this story seems familiar.