By that I mean that most of the time I'm grouping, unless it's with clan members, it's always in complete silence. You might get a couple sentences here and there, but most players just do their own thing and then leave after mission is over. I might as well just be playing with better AI bots. I haven't played any other multiplayer game where most players never speak.
I hope one day there will be some kind of game mode that requires a bit more coordination with your group. I'm not sure what that game mode may be in Warframe, or if it's even something the developers really care about. Eidolon hunts I would say is the game mode that players interact with each other the most.