I don't know about that, since I'm not a gamer, but I just found out that they pretty much just used Wine to port San Andreas over. If you look in the Application Support folder, the folder hierarchy is pretty similar to a Wine prefix directory. Plus, it says Wine and has the Windows directory hierarchy.
Same here, I'm not a gamer, in the sense that it's not a high-ranked hobby of mine, but when I was on Windows, I used to game a lot. Now that more games are coming to Mac, I game more often (though not too much at all compared to the old days), so I guess platform influences my gaming habits.
Now that the most annoying bug is ironed out, I'm also not complaining, I don't care how they ported it, it's a brilliant game and works nicely. It entertains me and keeps me busy, so it's doing its job right now. Plus, easy updates through MAS is a nice bonus.