Litterally everything on COD4 is better in some way. WaW is litterally an inferior copy of COD4 set in WW2. I think WaW is a pretty good game if you discount the competitive online multiplayer, which is fundamentally broken. I enjoyed the campaign, coop is decent, and Nazi zombies is great. I often play Zombies, and whilst it is great its just ironic that the best part of the game is a bonus mode.