God, this subject has been beaten to death with a sledge hammer...next time do a search, it is there for a reason.
Anyways, yes, games run better on PC in general, because usually games for mac are ported over from windows, and are only done half heartedly. I agree that when software companies do it right, games can be just as equal for Mac. Also, i agree that the clientele isnt as great for gaming on the Mac side as the Windows side, which is why there arent as many games for Mac. The only reason I dont like running games on windows is because on my macbook pro, even thoguh I use an external mouse, the trackpad still is active so when my wrist touches it, it still works. Also, another reason I dont like using Windows is because I find it harder to judge if my macbook pro will work with some games or not, beacuse they have weird requirements.