I liked Agent Under Fire on GC.
The defining moment on split screen team multiplayer was when my other two friends were on the roof sniping at us, allied friend got killed.
I was like, "Sun-of-a-*****!" and grab a grnade launcher.
Aim at the roof with C-stick, and start boming them with mortars(as i like to think of it.)
I glance at their screen, and all you can see is grenade smoke trails.
One of them's like, "Get off the roof!"
The other: "Shuttup man, I'm trying to see though this smoke crap."