You obviously don't like Macs, but it helps no-one to spread disinformation. There are far more than "a couple" of games for Macs on Steam. Not your choice - fine, but don't mislead people who are asking for help.
Bootcamp is the way to run games smoothly on the mac, I've tried CoD:MW 1 & 2, both of them run a hell of alot better in bootcamp than in their native mac format. Gaming performance wise your better off with a seperate gaming rig.