The best Shooter ever created PERIOD.
The Campaign Mode in COD4 is the best storyline in any of the COD games because everything happens, from practising in training camp, to sniping in old farms in Russia, to battling in desert towns, to escaping on a truck and everything in between. Even though the actual campaign itself is really short ( completion between 5-6 hours ), alot happens in it, which gives you a really solid experience.
The weapons in COD4 are all pretty sick, ranging from assault rifles, to sub machine guns, to light machine guns, to shotguns, and to snipers. Some of the assault rifles are M16's, M4 Carbine's, AK-47's, G3's, M14's, you get the point there are alot of weapons in this game. Some sub machine guns included are MP5's, Mini Uzi's, and P90's. Light machine guns are M249 SAW's, RPD's, and M60E4's. Shotguns include W1200's, and M1014's. And finally some snipers are Dragunov's, R700's, and Barret 50.cal's. A cool feature in this game is to unlock attachments to your weapons like Red Dot Sight, Silencer, and ACOG Scope. Another cool feature is to add camouflage to your weapons like the Forest, Desert, Digital, Blue Tiger, Red Tiger, and Gold camouflages.
All these weapons, attachments, and camouflages can be used to your liking in the Create-A-Class feature. You pick what ever weapon you want that you have unlocked ( weapons are unlocked as you progress through the online portion of the game and level up, up to 55 at which point prestige is unlocked where you can show your worth by getting a new icon every prestige up to ten times ), get 25 kills with it to unlock the first attachment, Red Dot Sight, and get 150 XP ( Experience Points ). Do the same thing but this time get 75 kills to unlock the Silencer, and get 500 XP. Then finally the same thing, but this time 150 kills to get ACOG Scope, plus 1000 XP. Then get 25 headshots to unlock Digital camouflage, plus more XP ( you already begin with Forest, and Desert camouflage ), then 75 headshots to unlock Blue Tiger camouflage, plus even more XP, then finally 150 headshots to unlock Red Tiger camouflage plus even more XP. And if your feel crazy, then do all of these challenges for all of the weapons in any class to pick a weapon to get Gold camouflage for.
All the challenges are mainly kill and headshot challenges but some of them are to get kills with your knife, grenades, destroy enemy C4 and Claymore, kill with C4 and Claymore, run 26 miles and a whole lot more that make the online experience the best part of the game.
So, all the words I typed must've meant something to readers, so here is everything in a short sentence: Get COD4 no matter who you are , how old are you, or how you look, beacause the is the best single player and multiplayer experience you can buy anywhere.