"It has been six years since players first stepped into Azeroth, and still no MMO has come close to challenging the dominance of World of Warcraft (WOW). Blizzard works tirelessly to constantly improve the game at all levels. WOW has been through so many changes that it scarcely resembles its former self, but none have altered the experience as severely as Cataclysm. Although you can witness many of the changes via a patch, the expansion is the only way to try out the new races, professions, and endgame content. For veteran players, it is a necessary investment."