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Players have been pointing out issues with bots, bugs, in-game changes they don't agree with (nerfs, class changes, monthly achievement changes, dungeon loot etc) and for the most part it had been polite feedback.
Now, however, as Anet has failed to address basic items like bots and bugs, has not listened to feedback around their changes in game, and have made other odd moves (such as the recent change in WvWvW to remove Orbs because of hacking issues and Anet inability to fix the game - so poof - gone now along with the bonus to stats they provided) people have become more vocal.
Moderators are now taking a very heavy hand, deleting threads they don't like, issuing bans etc. even if the "complaint" is voiced in non-hostile, non-vulgar way.
This is never a good sign. Moderators have far too much power, restrict the honest exchange of ideas and feedback, and the forums become the realm of fanbois. Same thing occurred with TSW - its not at all player friendly.
Restrict vulgar people -yes. Shut down discussion and feedback on broken elements of the game? Epic fail.