Not sure if I can explain it and do it justice. All I will say is GW1 and GW2 has little in common. I am surprised they even bothered trying to connect it at all. You really felt like you are exploring with all the dynamic events.
To continue the lore and story. If game mechanics were the foundation of game continuations, then Mass Effect 1 and 2 wouldn't be related. Assassins Creed 1 and 2, etc.
GW1 ended with the awakening of the ancient dragons, the beings that gave magic to the world, and GW2 takes place 250 years later as the terror of these elder dragons is reaching its peak.
And if you like the dynamic event type thing, you should look into The Secret World. Its questing is rather interesting, specially their "investigation" missions.