Ya there are zombies. Its after you beat game. You in a a house thing and nazi zombies come and try to kill you but you shoot them with guns you buy off walls.
Left 4 Dead hands down. The online is way better and very unique. The story might be short but its fun while it lasts. All the COD have been the same. They only add some things when they come out with sequels.
call of duty 5 is fun. They did a good job on that. But left 4 dead is a game thats very unique. Every time you play it, its different. Live is awesome for it also. never gets old.
cod5 is better online but for not for story all cods are good online but nazi zombies made it for cod5 still think cod4s got the best story but not online play.