My Inner-Geek

I just finished beating the fantastic game Half Life 2 (and both of its expansions). With the fresh feeling of victory lounging in my brain, I got to thinking of all of the games have beaten. All of these held my interest long enough to play through to the end:

Quake 2
Unreal Tournament
Civilization 3 & 4
Command and Conquer Red Alert 2
Knights of the Old Republic
Jedi Knight 2
Half Life 2 (and episode 1 & 2)
Starcraft
Starcraft 2
Doom
Return to Castle Wolfenstein
Warcraft 3
Warcraft 3: Frozen Throne
Descent: Freespace
System Shock 2
Ghost Recon
Ghost Recon expansions: Desert Siege and Island Thunder
Max Payne
No One Lives Forever 2
Sins of a Solar Empire
Pirates!
Alpha Centauri
Railroad Tycoon 2
Age of Wonders: Shadow Magic