Ah, the games myth…
First: There are plenty of good games available for the Mac OS. I suspect your “approx. 25%” statement is one of those myriad statistics that are just pulled out of… the air… rather than being the result of scientific analysis and calculation.
For example: Battlefield 2142, Command & Conquer 3, Call of Duty 2, Age of Empires III, Civilization IV, WarCraft III, World of Warcraft, Unreal Tournament, Black and White, Doom III, Sim City 4, the Sims 2, Tiger Woods PGA Tour 08… etc etc. Even StarCraft II (not released yet, but announced for Mac as well as that other OS).
Second: Like I said, you can run windows on a Mac. Products such as VM Ware Fusion and Parallels desktop allow you to run windows and Mac applications at the same time, side by side, and cut and paste between them. True, they are emulators, so processor and graphics intensive applications may be slow, but in that case, you simply use Apple’s own BootCamp software to reboot your Mac into Windows (I recommend sticking with XP). At that point, you are no longer emulating but running “real” windows, so all your windows games will run just fine. Of course, you are subject to all those Windows viruses, adware, spyware and all that, so your Windows partition is just as vulnerable as any other windows computer… but your Mac itself is immune to all that.
Third: If games are the biggest reason you have a computer, you should think about getting a Play Station 3 or a Wii… (I wouldn’t bother with an XBox; they’re built by the same folks who brought you MicroSoft Bob, Clippy the Office assistant and Vista… and I can’t pick which of those three is the worst piece of crap…) You’ll pay less for the hardware and have better games.
My opinion, of course… YMMV.
Cheers!