Multiplayer Games played so far

Baldur's Gate 2
Blazblue - Calamity Trigger
Blazblue - Continuum Shift (Extend)
Borderlands
Dark Age of Camelot *
Dark Souls *
Dead Island
Diablo 2
Diablo 3
Dungeon Siege II
Dungeon Siege III
Dynasty Warriors 7 *
Fable 2
Fable 3
Gears of War 1
Gears of War 2
Gears of War 3
Guild Wars
Hunted - The Demon's Forge
Kingdom under Fire: Circle of Doom
League of Legends
Lost Planet 2
Magicka (+ DLC)
Mindjack
Moon Diver
Naruto Shippuden: Ultimate Ninja Storm 2
Naruto Shippuden: Ultimate Ninja Storm Generations
Naruto Ultimate Ninja 3
Naruto Ultimate Ninja 4
Naruto Ultimate Ninja 5
Neverwinter Nights 2 *
Ragnarok Online
Saints Row 2
Saints Row The Third
Soul Calibur 3
Soul Calibur 4 *
Splinter Cell: Conviction
Star Craft II
Star Wars: Jedi Academy
Star Wars: Jedi Knight 2
System Shock 2
Tales of Vesperia
The Cursed Crusade
The Dishwasher
The First Templar
Too Human
The Lord of the Rings: War in the North
Titan Quest *
Warhammer 40k: Dawn of War II
Warhammer 40k: Dawn of War II - Chaos Rising
Warhammer 40k: Dawn of War II - Retribution
Warhammer 40k: Space Marine Arcade
Warhammer 40k: Space Marine
Warriors Orochi
Warriors Orochi 2
Warriors Orochi 3

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Games that I currently own or could easily get ahold of that I have not yet played with others:

Demon's Souls
Metal Gear Solid Peacewalker HD for PS3
Various AD&D PC Titles
White Knight Chronicles (haven't played the SP Campaign yet)
SNES Emulator games (e.g. Secrets of Mana 1 and 2)