There will always be something enticing about the portrayal of MMOs within anime. Like .hack//sign before it, Sword Art Online tickles the fancy of those who revel in finding the glitches, the rare objects, the dark and hidden zones of online worlds that subvert the otherwise strongly governed rules and are all but untouched by the masses. For the first half of the series at least, again like .hack//sign, the pesky outside world cannot interfere, for the players of SAO are locked into Aincard by a nefarious programmer. Reach the 100th level and escape the game, if you die you die for real, if you try and take off the gear used to access the game, you die.
Three simple rules, ten thousand players, starting pistol... Go. From there protagonist Kirito, a beta tester and all-round MMO connoisseur, is able to single-handedly charge through what would otherwise take squads, groups, even whole guilds to defeat. A lovely bit of wish-fulfilment intimating that by relying on solitary skill rather communal co-operation a single person is able to succeed and thrive.