If you want to play games, you should probably get a PC

Another (small?) caveat for using a mac: If you want to play the very latest greatest 3d shoot 'em up games (as soon as they come out) you should probably get a PC.

Case in point: Doom 3, the long-awaited, ultra-hyped sequel to the Doom franchise came out a LONG time ago (like a year ago?) for the PC and has only just been released for the mac. And shock horror, all tests seem to indicate that it runs better on the PC. This is depressing, because I bought my mac expecting it to kick ass in EVERY respect over the PC - but hey, I didn't buy it for games.

So why does Doom 3 perform worse on the Mac - a machine that is supposed to be superior to the PC in every way and has had OpenGL engineered from the ground up on OS X to be robust and optimized?

Here is a very in depth article from the Doom 3 developers explaining why Doom 3 is slower on the Mac:

The performance differences you see between Doom 3 Mac and Windows, especially on high end cards, is due to a lot of factors (in general order from smallest impact to largest):

1. PowerPC architectural differences, including a much higher penalty for float to int conversion on the PPC. This is a penalty on all games ported to the Mac, and can't be easily fixed.