The best game on the web

Left 4 dead 2,cs,G. T. A,assasins creed brozerhood

Here is a General list of games I have played*play) over the network,I think at least one of these games will be of your liking.
Far Cry 3 (co-op MultiP)
GTA IV(MP)
SAMP
Bioshock 2(Co-op MultiP)
Borderlands 2 (Co-op)
System Shock 2 (Co-Op)
I hope you enjoy it+)

battlefield 3

Generals: Zero Hour
Imperium III
Unreal (in cooperative)
Serious Sam TFE/TSE (the identity of the co-op)
Quake 3 Arena
Half-Life
Minecraft

Battlefield 2
Battlefield: Vietnam
Call of Duty 4: Modern Warfare
Counter-Strike: Source
Crysis
Frontlines: Fuel of War
Minecraft.
Quake 3 Arena
Serious Sam: The First Encounter
Serious Sam: The Second Encounter
Star Wars: Battlefront 2
Warhammer 40.000: Dawn of War
Worms: Armageddon

With each of these games had not a little good time.

Warcraft III Frothen Throne (Warcraft Soccer)
Legue of Legends
San Andreas MultiPlayer
Rome: Total War (it is Possible to play the campaign and battle network)

Metal Gear Solid 3
Metal Gear Online
Metal Gear Solid: Peace Walker