Improves on everything Call of Duty 4 set forth and then some.
Visually the game is pretty much Call of Duty 4 on steroids. A few more details here and there, possibly a little more sturdy, but nothing that noticable unless you were really looking for differences. It seems the two things the developers really worked on were lighting effects and fire effects. Those are the two things I saw significant improvement in.
The soundwork is great. There's plenty of well done voice acting, an unfortunate rarity in gaming. The soundtrack itself is very tense at times and heroic/epic when it needs to be. The gun and explosion effects sound great as well.
The gameplay is essentially what you had in Call of Duty 4 but expanded upon. Everything is solid and the shooting is tight. The campaign is very intense, very cinematic, and much longer than the one available in Call of Duty 4. You can slo play through it on co-op this time around, which always makes things more fun. The multiplayer is essentially the same this time but in world war II rather than modern combat and the dreaded helicopters have been replaced with the even scarier attack dogs. One cannot forget the awesome nazi zombie that you unlock by completing the single player campaign. It really is a ton of fun to play with friends. Very sound gameplay, but nothing innovative.
This is an awesome game that's a ton of fun. It may not be the most revolutionary game out there, but it will certainly quench your thirst for brutal first person warfare.