Now this all depends on your definition of playable. For me, it’s a constant frame rate of 30 or above, with no drops below that… which in this case means WoW isn’t. Sure it runs, but it’s on lowest settings, with pretty much everything turned off, at 800×600 res, and the frame rate varied between 15 to 40.
I found that if I avoided any of the towns, or any area with more than 5 polygons, I’d be ok since it was seemed to run at 25+ fps… but how likely is that?
Still if I’m reaaaaalllllyyyy desperate for a game, it’s doable.