Ok, considering Mac users go for "ease of use", no typical Apple customer is going to buy old-tech, buy a video card, and then flash the firmware. That is where we aren't on the same page in our discussion. My argument consists of the typical user, while yours consists of the entire platform. From your point of view, yes, going through all that trouble creates a viable system. However, if you try to game with what Apple offers today for the mainstream user, you will suffer in performance (especially at native resolution). Also considering the lack of driver updates for OSX (the last offical ATI drivers were January), the package isn't entirely so convenient for the gamer. So in this case, agree to disagree.. as leads to my next point.
Regarding opinions, I'm not going to bother too much. You didn't back up your claim of OSX being a superior OS, but instead just stated it as a fact. That's fine that you feel that way, but OS choice is a matter of preference. All platforms have their strengths and weaknesses, where no system is technically "superior". So you can state what you wish, but just because you feel that way, it doesn't change the opinions of millions of others. And likewise, just because I prefer Windows, I don't expect the OSX users to care. To help prove my point, consider Linux. There are hundreds of distributions, where each one is configured differently, to satisfy different people. There is no distribution that is overall "superior". Even though I might think that Ubuntu is "superior", I don't expect it to affect you what so ever, and I'm definitely not going to state it as a fact.