It appears that Gaia's Craig Sherman thinks that World of Warcraft isn't a success when compared to the hundreds of millions of "willing-to-play" teenagers it hasn't managed to claim as subscribers. A ridiculous claim, as success is a relative term -- especially when comparing free-to-play titles with something like World of Warcraft. We're not saying that games like Maple Story or Puzzle Pirates aren't good, they're just a different breed of MMOs.
Maybe we should measure MMO success by degree of pop-culture status: Has Maple Story had commercials featuring William Shatner, Mr. T and Vern Troyer? Will Puzzle Pirates become a theatrical film anytime soon? No, but that doesn't make these games any less successful in their own right. Plus, that's a ridiculous way of measuring success. There's a lot of differences in these games, but one thing is for sure -- World of Warcraft is definitely a successful game.