The original Half-Life. I am a failure as a gamer and a person in general. Forgive me, Gordon Freeman. However, I did complete Half-Life 2 and all the episodes. Hooray!
Schwartz, if you paid attention, it's impossible to get a headshot on Zakhaev in that mission, as you always shoot his arm off, and "blood loss should do the rest". Apparently not though.
Shit, I didn't think there'd be any games I'm currently playing (i.e. Crackdown, PoP, Mirror's Edge, No More Heroes [I knew Sylvia sort of betrayed you but, wtf]) GOD DAMN IT
I agree with DisgruntledTable, Combine and the Burning Legion fucking everything up (I actually read that massive freakin' thing on the WoW website about the lore of Azeroth... seriously -.-)