Resident Evil 5.. good co-op game... but if you're looking for mass shooter.. probably resistance 2 or Killzone 2. Heard they're coming out with M.A.G. it's supposed to support 64 people online??
256 is stupid and its gona require some serious processing. i say this as i come from a Bf2142 background and the maximum 64 player maps couldnt even be played on my old pc, now this game is gona do 256 on a console... hmm and 64 was pretty hectic so far Cod4 has the best map size and player balance, providing you dont customise it and go over the limit
yea it's only epic if it's on the 360 right haha it would rrod 10sec in the match... but truth is 256 players is ridiculous. although it won't be a problem if each map was the size of a city in gta san andreas.