Personally, I liked zombies in WaW when I was playing with my friends the most cause we already knew what to do and how to properly cover each other.
Still I absolutely hate how the old maps are coming with the Hardened and Prestige Editions of the game. It's just another stupid activision grab for money. I think that the 4 maps should come with the top two editions, but if you already bought the maps once why should I have to buy them again? That way the developer can make some money from the people that didn't buy the maps, but those of us that bought it don't get screwed for it.