It took awhile, but Infinity Ward finally got the message that World War II is played out. With modern times and international affairs becoming more and more, shall we say, interesting in recent years, the 1940s just don't carry as much weight as they used to. Perhaps that's why Call of Duty 4 has a new subtitle, Modern Warfare. By bringing things into a fictionalized story that still seems fairly plausible, the developer has made a much heavier game. But COD 4 is more than just an updated setting. It's also an amazing multiplayer first-person shooter and a great but brief single-player campaign with the visual chops to make it a standout shooter in an era filled with seemingly dozens of standout shooters.
The only real catch is that the single-player is almost shockingly short. If you've been keeping up with this style of game, you'll probably shoot your way to the credits in under five hours. While you can raise the difficulty to give yourself more of a challenge, the main thing this does is make the enemies frustratingly deadly, which sort of detracts from the fun.
While it may have a lack of single-player quantity, it makes up for most of it with its quality. The game tells its story from multiple perspectives, and you'll play as a new British SAS operative as well as a US Marine. The campaign takes you from a rainy night out at sea on a boat that's in the process of sinking to a missile silo where it's on you to save millions from an unsavory nuclear-powered death. Along the way, there are plenty of jaw-dropping moments where you'll look around the room for someone to whom you can say, "I can't believe that just happened." In a world filled with war games in which the good guys come out unscathed and the world is left at total peace, Call of Duty 4 will wake you up like a face full of ice water.
Source : gamespot