The most salient difference between World at War and Modern Warfare is the WWII setting. In the campaign, you split time between two soldiers in two offensive theaters: the Russian push out of their homeland and into the heart of Germany, and the American struggle to wrest Pacific islands from the Japanese. Though you'll alternate between them every few levels, the campaign feels like one solid progression, thanks to the adept pacing.
World at War does make a leap for the Call of Duty series by offering two-player split-screen and four-player online cooperative campaign play. It's the same campaign as the single-player experience, though the number of enemies increases for every player that joins you. You can turn competitive scoring on and see who can earn the most points by killing enemies or reviving teammates, and this adds a bit of fun to the campaign and lightens to mood (it's hard to feel grim when there are point values popping up all the time). There are also special items called death cards in each level, and collecting these will allow you to enable a cheat for cooperative play (for instance, enemies die by headshots only or headshots cause enemies to explode). These add a little more spice to the pot, but the only tangible incentives are challenges. Completing these tasks (such as kill 100 enemies with pistols or take first 20 times in competitive co-op) will earn you experience points that go toward your multiplayer rank (co-op is not similarly ranked). Cooperative play is fun in its own right, but linking it to the addictive multiplayer ranking system makes it relevant in a whole different way.
By staying largely true to the formula that made Call of Duty 4: Modern Warfare so successful, Call of Duty: World at War has ensured a proven level of technical quality, particularly in the multiplayer arena. On the other hand, one of Modern Warfare's strengths was its fresh approach, and by embracing a familiar setting and familiar mechanics, World at War achieves greatness but falls short of excellence. This is only a bad thing if you are expecting this game to top its benchmark predecessor. If, however, you are hoping for an exciting campaign, fun cooperative play, and engaging multiplayer action, then you'll find a lot to be happy about in World at War.
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