Great story, even greater online multiplayer... this game will keep you playing forever.
I'll leave out my review of the storyline so you guys can experience that. To sum that up, it's awesome. :) Though it IS pretty short, the missions and storyline make up for it.
This is the part where I intended to spend the majority of my time on this review: the online multiplayer. It never gets old. I've played dozens of online multiplayer games (ie Halo games, GTA, Battlefield, Counter-Strike, etc) and I can tell you straight up, Call of Duty 4 is the best I've played. Up to 18 players can play in a single match online, with around 18 maps to play on. The progression/ranking system they give you will keep you playing and interested to say the least. The video and audio presentation, even in multiplayer, is outstanding (play it on a 60" Sony Bravia HDTV and you'll know what I mean). As you progress through the rankings, you gain perks, which can be used to aid you in matches. Perks such as increased bullet stopping power, UAV radar jammer to make you indetectable, Iron Lungs to help you hold you breath longer for sniper shots, and the infamous Juggernaut which will give you longer life.
All in all, CoD4 is one of the best multiplayer games around (at least in my honest opinion) and will keep you playing till newer and even better games come out. It's a must get for all PS3 owners.