COD 4 hacked, worries for Modern Warfare 3?

Last April, Call of Duty: Modern Warfare 2 was compromised when a hacker corrupted the game causing Xbox Live to send out "potential phishing attempts." That problem received immediate attention from Microsoft and Infinity Ward, and the issue has since been resolved. So why is it that Call of Duty 4: Modern Warfare has been experiencing hacking problems on Xbox Live since February 2011, but nothing has been done about it?

Here are the facts: Since February 2011, hackers and modders have been infiltrating public matches over Xbox Live. There are numerous types of hacks used which cause the following in-game experiences: The de-ranking of players in the same match as the hackers, the automatic Level 55 10th prestige ranking of players in the same match (for a price), unlimited ammunition, invincibility, walking through walls, seeing through walls, spawning on top of buildings, spawning out of the map, super speed, and probably others of which I am not yet aware. These hackers have ruined the excellent experience Call of Duty 4 used to offer and needless to say, it is a true shame.

In order to get a better idea of Call of Duty 4's current situation, I sat down and played 50 unique matches on Xbox Live. Of the 50 matches, a total of 33 were hacked. That means there is approximately a 66% chance of playing with a hacker who has modded the game to their preference. I found that every game type (Team Deathmatch, Headquarters, Cage Match, etc.) could be hacked as well. In the modded matches I played, I encountered over 40 different hackers. These numbers are as staggering and completely unacceptable.