although the short as campain is totally awesome the longevity comes from the best multiplayer experience of all time.
you play as two seperate people during on seamless story one British SAS officer called SGT Soap Mctavich and a US Marine called SGT Paul Jackson.
the story is very good consisting of a terrorist from a fictional country near Russia laying waste to the united states with missile warheads. and surprise surprise you are the guy who is going to kick his arse, it is also a lot darker and grittier than the first 3, consisting of torture scenes and numerous scenes of executions, the game has some of the best graphics ever seen in a game from 2007 and great setpieces with no framerate studders, it also has brilliant sound design the guns sound so real if you have a surround sound system you might forget your playing a game and feel like your in the action.
there are also a lot of memorable moments like bombs going off, one intense sniper mission, one mission where you chase after a terrorist while people are shooting at you, and more especially the last couple of missions, with tight controls and great weapons plus Captain Price is back and his moustache is as cooler than ever.
the only problem with not only the campaign but the entire game in general is that the campaign is just too damn short but its like a movie it is about double the length of a blockbuster film and it was probably meant to be played through multiple times.
now on to the best thing in COD4 is its online multiplayer, there is straight up team deathmatch, mercenary team deathmatch, free for all, ground war, domination, capture the flag and more with all the great mechanics, weapons, and even maps from the single player campaign.
as you play online youll be earning XP which you can use to go up ranks and unlock new weapons, classes, abilities, and perks. perks are like superhuman abilities to your player like bullets have more impact, run faster and more.
another great thing is kill streaks if you manage to kill 3 players in a row without dying you can use a radar which means all enemies appear on your map, then if you kill 2 more you can call in an airstrike on a specific area with enemies in it and more.
so thats COD4 great but short campaign mixed with one of the greatest multiplayer experiences of all time, it will be a no brainer to add this to your PS3, XBOX 360, or PC collection, it is a contender for game of the decade.