APB Reloaded [Steam store page]
Third-person shooter MMO with odd aiming and repetitive missions. The teams are often completely unbalanced and the mission goals sometimes are as well. Turtling many times wins the match.

Counter-Strike: Source [Steam store page]
More realistic and slower paced than some other shooters. The guns also tend to be less accurate than your normal video game for realism, and shooting while you run is nearly impossible. Still, a reasonably fun multi-player FPS.