I'll be honest... I'm bored of GW gameplay in general. I've gotten used to how all of the classes play and have had my fill of GW style combat (3000+ hours over the last two years). However, GWEN has totally impressed me with the quest system. I have yet to play one quest that I didn't think was freakishly cool! They make the experience seem fresh all over again!
Reasons:
1. Many quests feel more like missions than quests
2. There is a REAL story behind quest chains.
3. There are GOOD rewards for completing quests
If GW2 improves on this system... I can't even imagine lol.
Well done ANet! You've guaranteed that I'll buy this game