Singleplayer:
- Half-Life
- Half-Life: Opposing Force
- Half-Life 2 and its episodes
- The Darkness 2
- Assassin's Creed games (First one is a bit boring, but next ones are pure gold. Not really an action game, but gotta mention it anyway.)
Multiplayer:
- Day of Defeat Source
- Team Fortress 2
- Shattered Horizon
- Insurgency (HL2 mod)
- Firearms: Source (HL2 mod)
- Fistful of Frags (HL2 mod)
There you go.
I'm sorry I already own, and played all those.
Tribes: Ascend. Fear 3. PayDay: The Heist.
I played all of those too. PayDay: The Heist was shit btw.
- Shadow Warrior / Blood
- Hard Reset
- Cry of Fear (mod for Half-Life)
- Afraid of Monsters (see above)
- Alien Swarm
- Killing Floor
- The Chronicles of Riddick: Escape from Butcher Bay
- The Chronicles of Riddick: Assault on Dark Athena
- Clive Barker's Undying
Yep played those too. Hard Reset was crap game btw.
Delta Force: Black Hawk Down
Die By The Sword
Duke Nukem 3D
Mortal Kombat
GTA San Andreas with Biohazard mod
Some real time strategy games where's a lot of action
Warhammer 40 000: Dawn of War : Dark Crusade
World in Conflict
I played those years ago

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Download free! http://www.warsow.net/
http://www.youtube.com/watch?v=NkK80yRjrgM
Arcade style action gets me borred very quick, I would rather not waste my time downloading it.
How can you not like S.T.A.L.K.E.R. Call of Pripyat??!!
I am in shock....
Wtf? S.T.A.L.K.E.R is my 3rd favorite post-apocalyptic action game after Metro 2033. When did I say I didn't like it?
Mount and Blade Warband. - First person/third person in the battle Medieval RTS Action RPG -omfg so many words, it has everything but good looking women
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Trailer: http://www.youtube.com/watch?v=uTUVfmE2ViQ
A late-game Battle with cavalry: http://www.youtube.com/watch?v=ecNHq4464PI
War with the nords: http://www.youtube.com/watch?v=lr1ttIli2r8
Notice they're all in third person, but there is a first-person, they just prefer to video in third I guess.
Also, there are many mods that greatly improve gameplay, such as music and fighting sounds, so if you got as annoyed as I did listening to the second vid you're in luck
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I've seen that when it came out and I'm not into fairy tales and princese's . If I want all that I can always start to play Super Mario on my Sega console.
Condemned: Criminal Origins
Yes, I played that too.