What?
Game developers have usually stayed away from the Mac platform because the drivers are buggy, the documentation is poor and the developer support is awful.
Apple have been too busy with the iPhone and coming up with new APIs, but not bothering to fix problems with their current APIs and driver support.
Apple are in the stone age when it comes to graphics. Apple have only just started to support OpenGL 3.0 from 10.6.3 onwards, which now is two years and four versions out of date. Before 10.6.3, OS X used OpenGL 2.1, which came out in 2006. Apple always release machines with 1-2 year old graphic cards, but charge more than twice they were when they were launched.
Mac Pro and the Geforece GTX 120 is embarrassing for Apple. Apple put this GPU in their 2009 Mac Pro machines, at the time when the Mac Pro came out, the 120 was 18-24 months old, it is a re-branded 9500 GT, Apple only included them with 512MB of memory, yet charge over £150 for the card. You could buy the OEM part with 1GB of memory for £30 at the time, nobody no longer makes them, apart from Apple. Apple still sell the card on their 2009 Mac Pro.