Call of Duty 4: Modern Warfare didn't receive anywhere near as much hype leading up to its release as its sequel has. That's a given considering it was the first in the Modern Warfare franchise and the first Call of Duty game to move onto the modern battlefield. We all knew it was going to be great, taking the series to all new heights with more advanced weapons and a great online experience. But it blew up. It went crazy. Halo 2 may have defined online gaming for consoles, helping make XBOX Live the great online service it is today, but COD4 seemed to redefined it. It was able to attract an all-new market of gamers to not only the genre, but also to online multiplayer gaming.