Large scale commercial games are mostly found early on Windows, but that's not to say that a large share of quality games don't exist on Macs. You just have to look at the shareware scene. Take just about any game made by Ambrosia (http://www.ambrosiasw.com), they are all high-quality offerings. Lately, I've been playing a lot of Escape Velocity and Harry the Handsome Executive on this old iBook that I rescued from work. Many hours of fun.
With any luck, this whole BootCamp thing will improve the Mac penetration by a large enough jump that they will start making games available earlier for Macs as an equivalent palatform, like they do with consoles.
One can dream.
I live on my Powerbook, and have for several years since I made the switch. However I have had to keep and upgrade a PC to play all the new computer games. IF a game is ported to a Mac it can often lags behind the PC release by over a year.
Now that we can take our (Intel)Macs and boot into XP to run the games, will anybody take the time or effort to do the port? I would think that a lot of the small casual game houses will still survive, but will the big titles even bother?
Just a shout out to Blizzard for realeasing together and on hybrid disks, but they are the lone shining spot on the barren Mac gaming horizon.