Well, Cod:Waw. Same like cod4, just completely different at the same time!
Single Player: This is one of the main focal points of the whole game. The single player is outstandigly good! No more defending Russia, instead, destroying Germany! Isn't that a welcome change? The Pacific Theater is also good, but I prefer the Russian Campaign better. The variety of guns and styles of enemy soldiers (Japanese Banzai attacks) makes a lot of variety in the single player.
Multi Player: To me, Cod:Waw Online was a mod of Cod4. Same things, same systems, same, same, same. Different Guns, Perks, and Options make a welcome appearence but don't change anything. This game is solidly based on Cod4. Without it, this game would probably end up like Cod3.....Eww. Tanks I think are not necesserary, they are just items people use to get more kills. Hardcore doesn't even include it, so there's no point. The kill streaks are interesting, except the recon plane..... I didn't know they had those in WW2. Dogs are fun to get, but are annoying when they are used against you. They are easier to kill though, then that helicopter that took a year with an M60E4 to shoot down in Cod4.
Nazi Zombies: I think this little extra in the game is the best of all! This mode solidly gets my rating up to 9.5! The first one, Nacht Der Untoten, was solid. The new one, Zombie Verruckt, just blows me away! Electrical Barriers, zombies completely act different as well! This is a crazy mode me and my friends all enjoy! One issue though; it takes a year to find people to play with. I click on "Nazi Zombies" Go to my room, relax a little bit until I hear Microphone chatter, which is in about 10 minutes.....Not my favourite of games, is waiting.
Extra Notes: I love the gore, it makes the game much more realistic! When I die from a random grenade, I like to check myslef out without a leg before respawing. Very, very, cool.
Pick this one up, you won't regret it. Except when you keep dieng and dieng in multiplayer. But that happens in cod4 too, so don't worry.