In dungeon and skirmish groups, nobody ever seems to talk in this game. In other MMOs I hate this kind of antisocial behaviour, but in Neverwinter I can't blame people, considering that the action combat really doesn't lend itself to pausing to type something into chat - especially since the controls require you to effectively "tab out" of your character to access the chat box.
On the rare occasion when something does need saying, such as when someone is overlooking a crucial fight mechanic that causes the group to wipe, typing feels clumsy and awkward, as if I don't really know how to talk to people in this game.
On the plus side, nobody bothers to berate other players either. I've seen a lot of wipes and poor performances in group content already, but not once has anyone bothered to complain about any of it in chat, which makes the community feel strangely welcoming even in its complete and utter silence.