First and foremost its a quality MMO that does not have a subscription, its not Guild Wars 1, and its different in the sense its not that "WoWclone" that the ignorant and uninformed claim it to be.
I never touched GW nor did I have any interest in it because it didn't look appealing to me and I was already playing WoW at the time and enjoying it a lot.
For me and several of my friends who have quit WoW we're just looking for a fun game that we can all play with together and GW2 seems to be the answer. Honestly after playing in several events I was not disappointed and the game truly deserves the hype unlike a few others that I've bought into because I didn't do any research.