I hope this doesn\'t piss too many people off, but I think the Xbox is much better for multiplayer. Because the system is more powerful than the PS2 almost all of its games have a four player split screen mode with almost no slowdown.
Some 4 player Xbox games:
Halo (2 player co-op is AWESOME!!)
Rallisport Challenge
Jet Set Radio Future
The thing that scares me is that the Xbox could do a four player GTA3... the moment this becomes a reality is the moment I need to change my underpants. :eek:
My favorite MP games on the PS2 are:
Most sports titles
Timesplitters
TM:B