So many quests bug out, or the quest giver disappears when the first mob is killed before they complete their opening dialogue. Either give a skill point at the end of the first ever complete on a character and make the quest repeatable, or just make every quest mundane and auto advance and auto pick up on entry. It's annoying as hell when you're queued for nearly an hour for a dungeon and then the quest bugs out... your entire purpose is for the skill point and it bugs... it's a massive waste of time and so annoying you turn off the game and play something else for the rest of the day.