I played WoW for 5 years - usually never for more then 5-6 hours a week. In that time I freelanced and was rather successful for it. I also got married, bought a condo, and did many other things happy productive people did.
I got mocked by friends who insisted I was addicted when they were paying 100-200 dollars a month on new games and spending upwards of 20+ hours a week playing them.
edit: don't play anymore because that type of game is now like melba toast to me. No amount of jam can make melba toast taste good.
Blizzard is in the business of making money through making games. It is in their interest to keep users playing month to month because of their recurring fee. In order to do that, they need to keep the game fresh so they introduce a lot of content. People want to play this new content so they keep playing.
E.g. The inside of a casino always looks the same, even at night. No windows (being near the entrance is the exception), lots of bright lights. It makes it easier for a gambler to lose track of time.
Before Zynga and before free to play games were popular, MMO's like WoW were the default case study for arguments about where the line is, between a pass-time and a conditioning chamber.
Both of those are perfectly fine hobbies, and I bet people interested in them absolutely have skills and accomplishments they're proud of. And that's fine. I may not get the hobbies, but I'm certainly not going to judge the value of how they spend their spare time. That's for them to determine if they're happy with. And I'll worry about my spare time.
To bring an overdone statement in to the mix: "guns don't kill people, people kill people". It isn't the game, it is the individual who already has addictive tendencies. It doesn't matter if it is WoW, another game, or another activity people who are predisposed to addictive behavior will tend to go overboard on their chosen activity. It isn't WoW's fault (because if it is, then many other games should be brought into this blame list).
WoW isn't a game you can finish or win, and it manipulates players into continuing to spend more and more time in it. That's the part I think is damaging.
I'm surprised that a WoW player running for political office doesn't in and of it's self alter your expectations of players.