I think RPG's need such alternate quests where you need to choose one over the other. They spice up the game. Think of how much more boring it would be to solve quests after quests without really having to make choices.
As a new addicted player (damn you <img src="/ubbthreads/images/graemlins/beyond.gif" alt="" /> betatest <img src="/ubbthreads/images/graemlins/devil.gif" alt="" />) I thought it was good when I first came across such quests.
