Im going to say this but usually infection is fun because it evens the odds of being zombies or humans as in the zombies have a better ability and the games are shorter but i usually play alpha zombies due to how common it is but i still kick butt as a zombie on there because of how skilled i am i go incognito and stuff. oh and infact i got a medal for killing i believe 10 survivors in a lifetime or it was 5.
[Edited on 01.15.2012 6:52 PM PST]