I remember a friend of mine, gloating about how he could play Unreal Tournament on Mac, and I looked at it, and man did it ever run natively. But I could see a lot rendering wrong and a lot of stutters.

I think the pentium compatibility stuff in the powermac was also supposed to attract gamers, but I recall not being able to progress past the installer for Mechwarrior 2 Mercenaries, which would have been the game that made me change my mind. Ran the installer tho, which was something.