Aion is a polished product what is rare for a mmo release this days... But it lag two things WoW got! There are no mounts in this game, the zones really feel small, the flying part is really limited you can not fly to the other side of a map for example! The game will not run on the lower end computers! And the big lag of content compare to the World of Warcraft size the World of Aion can fit in the starter zones of Wotlk!

How ever this game is looking great and better mechanics wise in almost every way over WoW.