The original Guild Wars was an MMO praised for having such a good and well told story. Other MMOs of it's time had trouble in the way they told the story to the players. There would be a massive group of quests which you would complete almost mindlessly, not knowing what or why you are doing or even which quests were meant to be story based and which were meant to be experience filler.
"...the game's story enjoyable, interesting and engaging, they have tried to get what was good about the first game and improve on it."This differs a great deal even in the original Guild Wars, when opening your quest log, you will see a list of quests. Some of which will be marked as "Primary Quests", these are quests which will advance the story. Another major improvement on most other MMOs is the mission system in Guild Wars 1, this would tell the story in an instanced, controlled, atmosphere.
When playing Guild Wars 2; ArenaNet have tried to hold their ground and make the game's story enjoyable, interesting and engaging, they have tried to get what was good about the first game and improve on it. They have done just that, from adding voice actors to creating many different story arcs based on the choices a player makes has pushed the bar up within MMO storytelling. You are able to make choices as a player from character creation, the story you experience is entirely based on these choices. When you choose your character's race; you are altering the story, there are also a short group of questions which alter the story in many ways during character creation too. Not only does this create an amazing story experience, but it also makes the personal story enjoyable several times over!