Best Multi player game?

Me and my bf are looking for games to play togeather. but cant find any we are attached to. so any games for the :
wii
PS2
GC
or PC
that are multi player would be awesome
we have played james bond, new super mario platform, mario race cars, super smash bros, stuff like that,

im also looking for one that isnt mostly a one player and has a 2 player on the side, that has nothing to do with the game. like N64 bango kazoi. not that,

we really enjoy the new super mario for wii. so anything like that.
thankyou!

GC:

• Timesplitters
• MetalArms

PS2:

• Killzone
• Marvel Ultimate Alliance

I'll let you know if I think of others. I'm drawing a blank right now.