Consumer Affairs on Video Game Violence
(Image used under: Creative Commons 2.5 [SRC])
The title is the Addictiveness of Virtual Violence, but even by admission of thier own article, it's not the violence that's addictive, but the psuedo-social aspects as well as the feeling of building something worthwhile. "If I just work another 8 hours, I'll gain a level (whee!)".
On that note, you might be interested in my article about avoiding gaming addiction while still playing the game. In my case, I play the far less popular City of Heroes (as opposed to the massive audience of WoW), but the principle still applies.
Tags: Gaming, Video Game Violence
The overall conclusion is that there does appear to be a connection between violent games and violent thoughts in a laboratory setting. But the connections between such thoughts and violent behavior in the lab or elsewhere are tenuous at best. The studies that try to address those questions currently suffer from a lack of a standardized measure of violent behavior and a lack of sufficient background on other potential influences on the test subjects' tendencies towards violence, such as family environment.