Team Fortress 2

[Lost]

Originally, there was going to be a 10th class called The Civilian, but for gameplay reasons, they canceled it. I think the 9 current classes are good enough, especially since Valve expands on the classes with updates, which give a new twist to the gameplay.

Speaking of which, the next official class update is going to be the Sniper. They said on their blog it's pretty much completed for the PC, but it hasn't been released yet because of memory issues with the Xbox 360.