I liked the article a lot; it gives a perspective from someone who understands both the psychology of addiction and the appeal of WoW.
It seems like any time the words "addiction" and "WoW" end up in the same sentence, you see people take a stand one way or the other. Either WoW is evil and everyone who plays it should quit immediately because sooner or later it will take over your life, or WoW is fine and it's just the screwed-up people with addictive personalities who play it who give it a bad rap. The truth is somewhere in between: WoW is designed to keep you playing, but it's a matter of your own self-control whether you let it take over your entire life or just become a (time-consuming) hobby.
Look, I've played WoW since a month after its release, when I was a sophomore in college. I've raided in all three expansion cycles (up to C'Thun in vanilla, killed Illidan in BC pre-nerf but only cleared Sunwell post-nerf, and with both 10 and 25 man Lich King kills in WotLK), I follow WoW news sites and forums, and I'm working on my 8th 80 (seriously). And in the meantime I graduated with honors from a well-regarded university, landed pretty much the best job out of school I could ask for, and actually get out of my apartment on the weekends. Could I have used my free time better? Probably, but there's no fun in min/maxing your life like that. If WoW destroys the life of everyone it comes across, then if my life hadn't been "destroyed" I'd be a multi-millionaire by now or something.
On the other hand, everyone knows That Guy who started playing [insert MMOG here], ended up dropping out of school, gaining 100 pounds, holing up in his parents' basement, and not seeing his friends for 2 years. Okay, so that particular story is a bit of an exaggeration in most cases, but there are certainly people who don't have any self-control. I see guild recruitment ads all the time making a big deal about how "hardcore" they are, that they raid 6 nights a week for 5 hours a night (never mind that the best guilds don't actually do this except maybe for short periods). This isn't healthy, and it's a big problem that no one gets that fact through to these aspiring guild leaders.
All of which tells us that saying "WoW is evil" or "WoW is never the problem" is shortsighted. There's very little research on how MMOG addiction, and video game addiction in particular, compares and contrasts with other kinds of addiction, and we need people to do it who aren't beholden to one extreme position or the other.