Simply put, CoD4 is the best military FPS I have ever played.
User Rating: 10 | Call of Duty 4: Modern Warfare PC
The single player campaign, although shorter than would be ideal, is absolutely breathtaking from beginning to end. The online multiplayer is the real kicker though. It is just about perfect; I could literally not think of one weakness or oversight. Graphics are great, sound is amazing, control and feel are second to only one (HL2). These are all praises I would have heaped on CoD (1) back in the day, Infinity Ward has done an amazing job keeping this franchise fresh and enjoyable.
In my opinion, this game takes a back seat to only one other FPS action game of the last 5 years, Half-Life 2. I would say the single player is right up there with FEAR for immersiveness and making you really want to get to the next section... all the time not wanting to for fear that the game will end at the end of the next chapter.
This is a MUST buy game. Amazing.
You owe it to yourself. ... And even if you don't, buy it anyway. 
