I run BioShock Infinite and Batman Arkham City on my 27" Retina iMac, and in setting up my new MacBook, I downloaded them from the App Store Purchases Tab. BioShock Infinite doesn't run at all, and Batman comes up with the splash screen and that's it. I have tried deleting and redownloading. I also downloaded Doom 3 and Quake 4, and they run fine (albeit VERY low screen rates at highest settings). Some compatibility issue or something? Thanks.