This is the first episode of South Park I ever watched. It's really frickin funny to say the least. I have played WoW and this is pretty similar to it. There are a few inaccuracy's that serve the plot, but they get the feel of WoW across.
The whole plot centers around a guy with no life who is killing players for no reason. The boys go to desperate measures to stop the player. Getting Butters off of Hello Kitty Island Adventure, convincing Craig that if he doesn't help he's French and abandoning there lives altogether to kill boars.
The last lines of the episode, after the defeat of the evil player are as follows.
Stan: So now what do we do?
Cartman: What do you mean? Now we can play the game!