I played DB quests - seriously fun and interesting quests. However i restarted with another character as it just doesn't make sense to me to kill everyone for no reason and then try to help other people or join other guilds. But if you played the game as a good guy and want something interesting DB is the way to go... become a vampire too ; P.
Last note would be if you, as a player don't think that it is OK to kill people for fun or profit, it might feel a bit wrong to play the DB quests. But its just a game after all, so play on.
