I thought the ad was funny.
It poked fun at a stereotype that is, honestly, all too often true. Not always by any stretch of the imagination, but there certainly are a lot of "alone in the parent's basement" gamers, both tabletop and MMO. Walking around Gen Con, you'll see plenty of people who validate the stereotype, and plenty of people who shatter it wide open.
Some people are too easily offended. There are things in the world worth really getting upset about, this isn't one of them.
It's probably also effective advertising, since we're all talking about it, and if it leads a few MMO players (seeing it in a computer gaming magazine) who used to be RPGers to look at the hobby again, or gently nudges an RPGer (who reads it in dungeon) to not walk down the dark path of MMO's, it's done it's job.
Personally, I used to play Everquest heavily between '99 and '01, but I haven't MMO'ed since. I've been tempted to start with WoW, but I don't want to go back go gaming for hours on end at my computer instead of gaming at a table where I actually see and interact with actual human beings.