I got to lvl 48 (out of 60) in wow. Many of my mates were in high-status lvl 60 guilds, with large runs on every night.
It really does take over your live though, we all stopped the same week cold turkey. It can get very addictive, but its only because its such a believable and immersive universe.
Dispite all the extreme gamers, it really is a fantastic game, and i enjoyed spending hours exploring new cities and continents, as much, if not more than leveling my character.
id recoment it to any1.
its only when a group of people start playing it religiously, it gets worrying.