Not the best multiplayer but damn near close.
Of course, everyone bought COD4 for it's online and this is where the game is truly at. It's a very odd multiplayer because it's very inconsistent. There's a ton of random problems that haven't been fixed(nearly 2 years later). You'd think IW would fix the problems in their original game before moving onto a sequel. The randomness I referring to of course is the frag spamming, poorly done spawn system, **** killcam, terrible matchmaking and poor balancing of perks. If you've played COD4 to any extend and are somewhat good at it, you definitely know what I'm talking about. A HUGE plus to the multiplayer would be to a have game type where there's no perks or special grenades. This way it would actually take skill to play COD4 besides good luck and tactics. I have a lot of gripes with this game and before you say "o, u sux @ c0D4 dats y u dunt liek it!!11" STFU, my K/D ratio is 2.15 and my accuracy is over 20%. However there's really no multiplayer experience that beats COD4 when you're destroying the enemy team and running'n gunning:D No one forgets their first 20-25 kill streak or even 30 kill streak. Call of Duty 4 is a great game but it could have been so much more.
BTW, you noobs that are Gold Crossers stop using the M16 w/RDS Frag x3, Stopping Power and Martyrdom. You're not good, you have no skill, you suck! Thank you :D