Spy will be useless you maccigarettes. So will a lot of other classes. Mainly spy though.
Don't get me wrong: PCs are fuc*ing epic for gaming, and Macs are mostly for work, but sometimes Macs can work quite well for games (Or at least for the 2 or 3 games you can play on it). For instance, crossover games used to work with steam before it was uberly updated and changed, and I played TF2 all the time on it when we traveled. (Used to be the only laptop we had until 2 days ago.) Spy was my best class, And I could right click quite easily because you didn't have to press ctrl click or anything, you only had to slightly move your middle finger onto the touchpad, and ever-so-slightly click the button, and huzzah! the spy was instantly cloaked! (I still hate macs when it comes to gaming though.)