Battlefield 1942 (Desert Combat Mod as well)
Battlefield Vietnam
Battlefield 2 (Forgotten Hope Mod)
Battlefield Bad Company 2
Call Of Duty 4 (Gungame and Oblivion Mods)
Enemy Territory (The Old Original One)
Quake 3 (Or Maybe Quakelive?)
Halflife 2 (The Hidden Mod)
Fear Combat (Free Version)
Flat Out 2
Trackmania Nations
Age Of Empires
Red Alert
Company Of Heroes
Medieval 2
World In Conflict
The ones I've bolded I have, and the ones in blue I also have, but just don't enjoy as much.
Which Red Alert? 1, 2, or 3? Love Yuri's Revenge. Nothing like Crazy Ivan strapping C4 onto a cow, and get Yuri to make the cow walk into a bunch of enemy troops (who won't shoot the cow)

Or chrono-jumping a chrono commander into a base, setting charges on every building... epic lolz when someone see's timers on ALL of their buildings

AoE is epic. Have the demo of Age of Kings, and is the one most people have.
Love DC, as well as BF42. Nam is also good. BF2, fun, but got sick of playing on public servers, with people who shoot you when you try to take "their" plane, and then crash it into a tree.
Original ET is good, but the ET clans have been around so long, and know the routes so well, it's only fun amongst ourselves most of the time.
FO2 is epic. TM is also good, but I prefer being able to take out other people

Anyone got a nocd patch for BFV btw?Cant keep swapping cds 
Have a mini-image, but punkbuster doesn't like it

CoD4 is good for gungame and oblivion. Esp oblivion, as when played properly, and no-one saying someone "has taken over my body" is great laughs.