For me its the over all design of the game, the classes are way different and your personal character story makes things interesting.
and for me a big draw is .. it's not gear oriented, sure you need decent gear but there is no real minimum requirements like there is in WoW which for me personally makes heroics and raids in WoW feel like work almost as much as fun but that's my personal oppinion.
The ranger is alot of fun, the pets are abit less interactive than in wow but the class has more options such as switching between equipped weapon sets. random world events.
and if you enter a lower level zone your level goes down to match the zone you're in , sadly the same doesnt happen for higher lvl zones

just my 2 cents
