I'm going to say this very seriously. Lighten up, all of you who complained about zombies and infections and quest killing. It was one weekend out of your lives. It's over now, and I for one am sad. There is nothing to break up the monotony like an army of the living dead coming to eat your flesh and make you one of them.
Now, I understand the frustration of finding your auctioneers, flight masters or quest givers dead. Perhaps I understand it all too well, as on my server, a PvP server, that can happen at any time. And perhaps that makes me more tolerant of being ganged up on, whether it's my own faction or not, and being turned into a zombie.
I do not understand the people who became upset about the zombie event for one simple reason: if it bothered you so much, you could have shut off the game. You could have read a book, you could have played a different game, you could have taken a nap, gone to the movies, began thinking about NaNoWriMo or NaBloPoMo, you could have written a song, volunteered at a hospital, watched some TV, daydreamed, called your Mom or Dad, gone out with friends, gone camping, done theorycrafting, taken up kickboxing, played with your children...the list is endless. If something you want to do becomes something you do not want to deal with, the answer is not to complain about it, especially when it is temporary.
Try enjoying it, instead of figuring out every way it is an inconvenience to you, next time. And if you still can't, you're wasting more time complaining when you could be doing something else.