My first online multiplayer game was Diablo. I have avoided every online multiplayer RPG since, and generally avoid multiplayer "experiences".
Multiplayer video games are a cesspool of the worst elements of society. You have to be relatively well-off to afford everything you need to play. In fact, the more well-off you are, the more time you have to spend in the game, the more likely you're going to be an asshole.
You're anonymous. You're being competitive. You are (mostly) rewarded for being a complete asshole (loot, loot, precious loot! loot the newb corpse!)
At least before voice chat you could close the text box or put it out of your mind. Now, if I decided to partake, I'd have to deal with 8-year-olds telling me how they fucked my mother in the ass and how she moaned (when they don't have to tell me, I could hear it just fine).
Fuck multiplayer. Other people are too shitty to play with.