I've only had a very short time with the Nazi Zombies mode on Call of Duty: World at War, but what I did play was very fun.  Of course, I was already spoiled by Left4Dead, buteven with that I still enjoyed the different experience of playing Nazi Zombies.  The new level, Der Riese, looks like it will be a great addition to the other two maps.  the CoD:WaW Map Pack 3 will be available next week on August 6.