There are. But that is not the norm, it's the exception in the hundred of hours of mission play in the game.
I accept that in some peoples minds.. they consider them worthless and don't do them, which is fine. But it does not change the context of my comments about missions.
I wouldn't really call It the exception. For every faction quest in a quest line, there are at least 2 missions completely unrelated but in the same area. I would say the game is 50% questline and 50% stand alone quests.