I don't normally play MMO's, but recently I have been playing a couple of free-to-play ones with my girlfriend (still trying to settle on one). They all seem quite good; nice graphics, good gameplay, not too bad lag. But what differentiates these free Korean MMO's with World of Warcraft? We're thinking about getting WoW accounts in the near future (frankly paying a subscription to play a game online is something I'm not too comfortable with, but if it's a good game then it might be worth it).