Now for the good stuff; multiplayer. Multiplayer for Call of Duty 4 is mostly what made it so popular and in Modern Warfare 2 it gets even better. The addition of many killstreaks and having the ability to customize which ones you want ,with a max of 3 available at once, is where this game's multiplayer action really differs from Call of Duty 4. Even in objective modes like Search and Destroy, you can gain killstreaks throughout the course of many rounds, granted you don't die at the end of the round. And if you try using you stealth class from Call of Duty 4 or World at War in this game you might not be safe with the addition of Heartbeat sensors as an attachment to certain weapons which detect movement. Of course there is a perk to counter that though. Many perks from Call of Duty 4 have been made into attachments or equipment. There are many additions to the game that will really let you personalize your class to your liking, much more so than the previous Call of Duty games. I saw a lot of people running around with many different class setups instead of seeing everyone with the same 5 as in the other games. You can now unlock titles and emblems for yourself that show up in game. Modern Warfare 2 has added more modes as well. Here are the new additions to the game:

Demolition – Attack & Defend two bombsites (Similar to Sabotage with full re-spawns)
3rd Person Teams – Third Person Perspective with Team Deathmatch, Domination, CTF and Demoliton
Hardcore Ricochet Search and Destroy – Hardcore S&D where friendly fire will kill you
3rd Person Cage Match – 1v1 Deathmatch in Third Person

The added guns to the game are also cool, and the models for them are extremely detailed. With all the additions to multiplayer, it can take a little getting used to but is extremely fun. Nothing like killing an enemy and stealing his Care Package (random killstreak reward) only to find out it's an AC-130...satisfaction. For the fans of the original Modern Warfare, this game still maintains the same core gameplay mechanics as Call of Duty 4. Modern Warfare 2 might just be the most fun I have ever had playing a game online.