Yeah, I wouldn't be surprised if you got WoW running even on Intel GMA video. But I tend to think rationally that if you are interested in playing one game now, a couple of years later you might already be playing some other game.
I don't actually know how GMA is today but a little while ago the net was still full of people whining how they can't run one game or another on a laptop with only such a video chip. That's why I wouldn't ever go for it, unless I knew with absolute certainty no game will ever be installed on the system.