re: Mac gaming in general, bad idea?
I have to disagree with you here. I've primarily been a Mac user since 1999-2000 or so, and while sure, the games available for Mac are few and far between? I've enjoyed most of them I bought over the years.
Steam is the best thing to happen to Mac gaming in recent years, because finally, you can buy a title and receive the ability to download versions for Windows too, at no extra charge. Plus, it keeps all of your content in one place. No more B.S. where you lose the original manual for a game that had the "CD key" printed on it, so you're unable to reinstall it.
My experience is, the Mac users who whine about how bad the Mac games are usually try to run them on totally inadequate hardware. (Ask *any* Windows gamer how they feel about Windows gaming on machines using integrated Intel video! They wouldn't even THINK of trying it! Yet a bunch of people who bought a basic Macbook a few years ago are trying to get the latest games off Steam to run on it, and whining how poor the results are! Same issue!)
I've using both a 2006 and 2008 Mac Pro as my primary 2 computers at home, and either one runs any of the Steam games I've purchased (Left for Dead 1 and 2, for example, or Civ 5) just fine. If you're one of those people fixated on benchmark scores, then no, the Mac won't give you as high a reported frame-rate as the right Windows system. So WHAT?! I don't CARE what the FPS number says, as long as the game is playing well and it looks good.
What I *do* want to avoid is having to reboot into Windows, which I never use anymore otherwise, and inevitably getting prompted to do 50 or 60 update patches to things before I ever get to play the 1 game I'm trying to launch. It's so much more convenient when I can just run a game inside OS X, where I do everything else anyway.
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Advice
Don't buy it. Mac port gets even worst. In steam page, there is no system spec. You don't know whether your Mac can handle. Honestly gaming on Mac is really bad idea.