Ultimate Multiplayer game would be

A death match game with
Solid Snake representing PS2, Samus Aran Representing Nintendo, Max Payne Representing the PC, and Master Chief from Halo Representing XBOX, who would win in a multiplayer deathmatch.

Some cyborg from Q3 would rail streak all their heads off.

ttt

snake would kill MC easy

MC is only tough cause of his suit and weapons. snake would just wait till mc was outside of his suit and knife him.

The dude from Dead to Rights(Blatant Max Payne ripoff) would throw a fire extinguisher into the other's midst and shoot it horribly scarring all of them for life.

"... and I'm all out of bubble gum" Duke