So I know the HD 4000 isn't great for gaming, but it can do it. My girlfriend wants to buy a Macbook, either this week or in 2 weeks if she goes for a 15" Retina. She isn't a gamer, but only because the only thing she has is an incredibly old Laptop that can barely run. She's interested in playing some games like WoW, Batman etc. So, how well does the HD 4000 actually run games at 1440x900 under OS X? Also, I see that most games now don't support the HD 3000, will games in a year not support the HD 4000? Thanks for any advice!