With great multiplayer and single player and a vast range of weaponry, you can't go wrong with Call of Duty 4.
The single player campaign is immersive and offers a lot of gameplay. It is one of the longer campaigns I've seen in a first-person shooter. The story is good and very few times will you see repetiton in objectives. You will do everything from blowing up tanks to sneak past enemies undetected while trying to assassinate overlooking guards. Also, the weapons are unique. For instance, there is a version of the M4 called the M4A1 which you can obtain in the campaign, but not multiplayer. This gives the missions a different feel, so you won't feel like you're just in a deatchmatch against the computer.
The weapons themselves deserve a section of the review. Call of Duty 4 has one of the most impressive arsenals I've seen in a game thus far. Whether you prefer the classic bolt-action sniper rifles or a semi-automatic one, you can get it. Or if you like shotguns and sub-machineguns then there are those, too. Of course there are the beloved assault rifles and light-machine guns for you to wreak havoc with. Also, the weapons in multiplayer can be customized in create-a-class. You can unlock attachments to put on your gun, like a better scope for your sniper rifle or a red dot sight for your assault rifle. Then you can unlock camo to paint the gun with. Even if you pick up someone else's gun, their gun will still be the same no matter who is using it. This makes the selection of weapons seem at least twice the size because you can be using a plain M4 but go pick up another M4 that has a red dot sight and desert camo.
The multiplayer is the real draw of Call of Duty 4. Whether you like Deathmatch, Team Deathmatch, or objective based games, Call of Duty 4 has it. It even has a "Classic Deathmatch" where you jump higher and you have "pick-ups" on the map, just like in the old days. In addition to that, the Deathmatch modes have "Hardcore" versions where your HUD is removed and your guns do more damage. This plus the gorgeous visuals and amazing sound make the game have an extreme sense of realism. Team Deathmatch is undoubtably the most popular, as I see the most people play it. It is a basic mode really, but the feel of Call of Duty 4 is what makes it so much better than other online shooters. When I first played it, I didn't care much for it. But then it grew on me until I was addicted to it. It becomes so hard to put down once you get into it.
This concludes my review. I hope it helped and I hope you decide to buy Call of Duty 4. It's an amazing game!
Final Scoring:
Graphics: 10/10
Sound: 10/10
Gameplay: 10/10
Replay Value: Single Player: 7/10
Multiplayer: 10/10